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-revision 1.1522 by mlosch,
Wed Oct 26 09:30:32 2011 UTC
+revision 1.1806 by jmc,
Sun Jan 13 22:55:56 2013 UTC
 Line 4 
 $Name$
      Notes on tags used in MITgcmUV
      ==============================
+ o pkg/mdsio:
+   - write missing value (corresponding to undefined array value) to meta files;
+     skip this if missing value is one (UNSET_RL would be a better value for the
+     case of undefined missing value but it's current the default missing-value);
+     Also update mdsio_read_meta.F (reading timeInterval & missing-value).
+ o pkg/exf & thsice:
+   - for diagnostics purpose, fill-up and update Qsw array (+ fill the diagnostics)
+     even when SHORTWAVE_HEATING is #undef;
+ o verification/cfc_example:
+   - turn on pkg/layers with pkg/diagnostics (to test pkg/layers and to illustrate
+     how to use it).
+ o verification/offline_exf_seaice:
+   in input: add SEAICErestoreUnderIce=.TRUE., and reduce size of forcing
+     files to only one time-record.
+   in input.thermo: narrow the 2 bands of low initial ice-concentration near
+     N & S edges; switch on SEAICErestoreUnderIce=T; use pkg/diagnostics for
+     snapshot output; same mcPheePiston value as in thsice with surf-current=0.2m/s.
+   in input.thsice: similar set-up as in input.thermo (channel with same seaice
+     initial conditions).
+ o verification/cfc_example:
+   - update file "data" with more standard choice (default rotationPeriod,
+     exactConserv=T, reduce ivdc_kappa to 10, remove multiDimAdvection=F,
+     set deltaTFreeSurf to deltaTtracer) and update the output.
+ o pkg/layers:
+   - fix bolus part so that it compiles with #undef GM_BOLUS_ADVEC;
+   - ensure that "layers_bolus" is switched to False when useGMRedi=False.
+ o verification/offline_exf_seaice:
+   - set all {field}period to zero for constant-in-time forcing (not tested
+     anywhere else).
+ o verification/offline_exf_seaice:
+   - dyn_lsr  : use pkg/seaice S/R (instead of pkg/thsice) to advect sea-ice;
+   - dyn_jfnk : use pkg/thsice S/R (instead of pkg/seaice) to advect sea-ice.
+ o model/src:
+   - implement Finite-Volume method for (hydrostatic) presure gradient
+     from S.-J. Lin (QJRMS 1997), for atmosphere using sigma-coordinate.
+ o pkg/seaice: implement EVP* by Lemieux et al. (2012).
+   - In order to be compatible with the default EVP code, this requires changing
+     the EVP code around a little; and because any small change immediately
+     breaks the lab_sea.hb87 verification experiment, the reference output is
+     updated two times (each time the remaining aggrement was only 2 digits):
+     - after replacing 1/dt by 1*recip_dt with a precomputed recip_dt
+     - after replacing 1/(1+0.5*dt/tau) by a/(a+1), with a=2*tau/dt
+     The adjoint test lab_sea.evp also needed to be updated.
+   - Turn on EVP* by setting SEAICE_deltaTevp as before, and setting
+     SEAICEuseEVPstar=.true.; for EVP* SEAICE_deltaTevp does not need to be
+     a factor of SEAICE_deltaTdyn, and you can set the number of EVP steps
+     explicitly with SEAICEnEVPstarSteps (thereby overriding the default of
+     INT(SEAICE_deltaTdyn/SEAICE_deltaTevp)). Controlling EVP* is deliberately
+     kept obscure, because I need to test it a little more.
+ o pkg/cheapaml:
+   - fix few incorrect type (_RL/_RS) in subroutine calls.
+ o pkg/seaice:
+   - new S/R SEAICE_MAP_RS2VEC (similar to SEAICE_MAP2VEC) to map _RS arrays
+     to _RL vector; this fixes JFNK code when compiling with "-use_r4" option.
+ o model/src:
+   - add a warning if using select_rStar=2 with nonlinFreeSurf <> 4;
+     change (in input_ad*/data) select_rStar from 2 to 1 for AD verification
+     experiments global_ocean.cs32x15 & tutorial_tracer_adjsens (+ update output)
+ o pkg/cheapaml:
+   - replace "273.1 _d 0" by celsius2K in pkg/cheapaml/cheapaml.F and
+     update output of experiment cheapAML_box.
+   - store in CHEAPAML.h coeffs ssq[0:2] for saturation specific humidity,
+     and set them only in one place (cheapaml_readparms.F).
+   - replace "273.16 _d 0" by celsius2K & replace "3.14159 _d 0" by constant "PI"
+   - remove re-setting of main-model parameter "celsius2K" (in cheapaml_readparms)
+     and re-setting of cheapAML params "lath" & "p0" (in cheapaml_init_varia).
+ o model/src/the_main_loop.F:
+   - fix revision 129 : need both ALLOW_ECCO and ALLOW_ECCO_EVOLUTION.
+ o pkg/seaice:
+   - remove legacy branch code.
+   - retire SEAICE_GROWTH_LEGACY and SEAICE_CAP_HEFF accordingly.
+ o verification/*/code*/SEAICE_OPTIONS.h:
+   - remove documentation for retired CPP flags (SEAICE_GROWTH_LEGACY,
+     SEAICE_CAP_HEFF).
+ o pkg/cheapaml:
+   - use standard routine (S/R GET_PERIODIC_INTERVAL) to decide when it is time
+     to load new forcing fields.
+   - add missing "_d 0" where it's needed; + some editing (improve indentation).
+   - remove switch to "-r8" compiler option (no longer needed) in verification
+     cheapAML_box, keep same output (small trucation error differences).
+ o verification/offline_exf_seaice:
+   - add thermodynamics only test.
+ o verification/cheapAML_box:
+   - split the domain in 8 (2x4) tiles; add MPI and multi-threaded test;
+     keep same output (same 14 digits for cg2d).
+   - switch on "-r8" compiler option (some numerical values are missing
+     the "_d 0") and update output (only 6 digits for cg2d were preserved).
+ checkpoint64b (2012/12/24)
+ o pkg/cheapaml:
+   - remove un-used variables (Qnet,EmPmR) from pickup files.
+   - store tendency of advected variables into cheapaml pickup file
+     and fix the AB-2 restart.
+ o verification/offline_exf_seaice and lab_sea adjoint:
+   - switch to new code (#undef SEAICE_GROWTH_LEGACY).
+   - switch to 4 time steps in offline, consistent with lab_sea.
+   - match parameters from SEAICE_GROWTH_LEGACY branch in data.seaice.
+   - update results after change of experiment seaice.
+ o pkg/seaice:
+   - remove option SEAICE_MULTICATEGORY; has been replaced with run-time
+     parameter SEAICE_multDim. Issue a warning if SEAICE_MULTICATEGORY is
+     still defined since SEAICE_multDim needs to be set to MULTDIM value (from
+     SEAICE_SIZE.h) to recover previous #define SEAICE_MULTICATEGORY default.
+ o model/src:
+   - add run-time parameter to select CG2D solver minimum-residual solution
+     (in case of a poor convergence).
+ o pkg/seaice/seaice_lsr.F
+   - move calculation of matrix coefficients into new
+     S/R SEAICE_CALC_LSR_COEFFS; for now this routine remains in the same
+     file; the main purpose of this change is to be able to reuse the code
+     in S/R SEAICE_PRECONDITIONER
+   - modify the computation of the residual so that the mass of sea-ice
+     is not used twice; this simplifies the calculations, but since
+     the residual is never used except when LSR_mixIniGuess.ge.4---and this is
+     not tested in testreport---this does not affect the testreport results.
+ o verification/seaice_obcs:
+   - disable SEAICE_GROWTH_LEGACY; reset input files to match those of
+     verification/lab_sea/input.salt_plume; changes results/output.txt*
+ o model/src:
+   - adapt quasi-hydrostatic formulation to work with p or p* coordinate.
+ o pkg/seaice:
+   - improve description of parameters in seaice_fgmres.F and start
+     cleaning up the code
+   - change name of SCALPROD to SEAICE_SCALPROD and modify meaning of
+     second argument
+   - add a metric based on grid cell area to SEAICE_SCALPROD; update
+     results of offline_exf_seaice.dyn_jfnk
+   - compute initial residual norm in seaice_jfnk based on SEAICE_SCALPROD
+ o pkg/aim_v23:
+   - fix an other bug in dissipation heating (grid-cell area was missing).
+ o model/src + pkg/seaice:
+   - add global (multi-tile) linear solver for pair of tri-diagonal system
+     along X and Y lines, respectively for U and V component.
+     Note: 1) MPI and cube-exchange not yet coded.
+) probably not accurate for poorly conditioned / large size problem.
+   - add option for SEAICE_LSR to use global (multi-tile) tri-diagonal solver;
+     default: not compiled and not used.
+ o pkg/seaice:
+   - first attempt at a multi-threaded fgmres solver for the JFNK solver:
+     introduce bi/bj loops and use global_sum_tile_rl instead of
+     mpi_allreduce in seaice_fgmres.F
+   - improve diagnostics output for fgmres solver (seaice_fgmres.F)
+   - replace a few unnecessary goto statements by if-blocks  (seaice_fgmres.F)
+   - add a verification experiment for JFNK in offline_exf_seaice
+ o verification:
+   - change (for now, only fwd test) offline_exf_seaice experiment:
+     use a re-entrant channel with idealized coastline (trapezoidal shape)
+     at southern boundary to explore seaice dynamics and thermodynamics
+     with simple forcing. Main set-up has dynamics+thermo and SST relaxation;
+     secondary test (input.thsice) use thermodynamics only with SST relaxation.
+   - add seaice-dynamics only secondary test using LSR and pkg/thsice advection.
+ o pkg/exf:
+   - disable "sstExtrapol" when Nr=1
+ o verification:
+   - add new experiment "cheapAML_box" (simple 1 layer set-up from Bruno Deremble)
+     to test pkg/cheapaml.
+ o pkg/aim_v23 & pkg/shap_filt:
+   - fix dissipation heating (erroneous gravity multiplication factor).
+ o pkg/seaice:
+   - remove unused field pressPre from jfnk solver
+   - rename two subroutines in seaice_preconditioner.F
+ o eesupp/src:
+    - S/R MDSFINDUNIT avoids reserved unit numbers (scrUnit1, eeDataUnit ...)
+ o pkg/seaice/seaice_preconditioner.F: fix preconditioner once again
+    - remove wrong parts of the rhs and the lhs (were in there
+      because I did not understand the concept of this preconditioner)
+    - add an exchange between u- and v-sweep. This increases communication
+      by a factor of two but improves the convergence of jfnk. Ideally,
+      one would like the u- and v-sweep to be independent. So far within
+      undocumented ifdefs
+    - reorganize the extra computations for printing the residuals
+ o tools/genmake2:
+   - comment out the "mpif.h" include in NetCDF test programm (for MPI built)
+     since it's not necessary (and was preventing to use MNC in some cases).
+ checkpoint64a (2012/11/16)
+ o pkg/autodiff:
+   - improve pkg-internal logical parameter switch (inAd/inFwd mode) so that
+     autodiff_readparms.F no longer depends on calling order (within
+     packages_readparms.F) and no longer requires to include ${PKG}_PARMS.h):
+     rename param turnFreeDriftInAdMode to SEAICEuseFREEDRIFTswitchInAd
+     and change param SEAICEuseDYNAMICSinAdMode to SEAICEuseDYNAMICSswitchInAd.
+ o pkg/obcs:
+   - adding tidal velocity forcing capability to obcs
+     for usage example, see verification/seaice_obcs/input.tides
+ o pkg/seaice:
+   - turn the LSR-relaxation parameters WFAU/V into runtime parameters
+     SEAICE_LSRrelaxU/V
+   - introduce runtime parameter SEAICEetaZmethod (=0 by default)
+ o pkg/aim_v23:
+   - implement heating from friction (bottom friction and stratospheric drag).
+ o pkg/shap_filt:
+   - fix diagnostic "SHAP_dKE" (was 2 time smaller); implement heating from
+     dissipation but only for Shap_funct=2, active when addFrictionHeating=T.
+ o model/src:
+   - move AddMass common block from DYNVARS.h to FFIELDS.h; allow to read-in
+     time-constant addMass field from file (addMassFile);
+   - support for heating due to friction (and Kinetic Energy dissipation):
+     add option, run-time switch and 3-D field array + support code ; each pkg
+     or S/R can add heating contribution (if there is a sink of KE); the sum is
+     accounted for as a Temperature tendency term (EXTERNAL_FORCING_T).
+ o pkg/seaice:
+   - complete merge of ITD code into seaice_growth.F
+     from MITgcm_contrib/torge/itd/code/
+     no verification so far, but Torge Martin tested
+     "1-D test case and Beaufort set up;
+     deliver okay results after 1 model year."
+   - complete merge of SEAICE_SIZE.h into all relevant routines
+   - move computation of eta at Z-points into calc_viscosities
+     + introduce global field etaZ
+     + add different methods for computing etaZ, for now the old
+       method (simple averages of eta to Z-points) is hardwired
+     + replace etaMeanZ by etaZ in seaice_lsr, seaice_calc_residual,
+       seaice_preconditioner
+   - simplify computations for SEAICE_ZETA_SMOOTHREG
+   - seaice_preconditioner:
+     + replace one remaining press by pressLoc (mistake)
+     + adjust printing of residuals
+   - improve I/O of diagnostics of JFNK in seaice_jfnk.F:
+     + add (SEAICE.h) and rename some counters (initiliased in
+       seaice_init_fixed.F)
+     + add _BEGIN/END_MASTER (myThid)  around print statements
+     + print total number of iterations and failures over SEAICE_monFreq
+       interval to STDOUT
+   - move control over output-messages by fgmres to seaice_jfnk to save
+     some operations
+   - move resetting initial guess for fgmres outside of seaice_fgmres_driver
+     in order to make restarts with sol .ne. zero (fgmres with restarts)
+     (seaice_jfnk.F, seaice_fgmres.F)
+   - seaice_calc_l/rhs.F: replace maskW/S by maskInW/S; this fixes
+     a serious convergence problem when open boundaries are involved
+ o pkg/ggl90: fix computation of control volumes for the case of
+   ALLOW_GGL90_HORIZDIFF (probably not used very often): move control volumes
+   up half a grid cell from C-centered to W-centered (pointed out by C. Eden)
+ o pkg/seaice: simplify seaice_evp by avoiding use of extra fields u/vIceC
+ o pkg/autodiff
+   - Add inAdMode switch for SEAICEuseDYNAMICS:
+     SEAICEuseDYNAMICSinAdMode
+     (extend logic in ADAUTODIFF_INADMODE_SET)
+ o pkg/seaice
+   - Step 1 of merging ice-thickness distribution (ITD) code from
+     MITgcm_contrib/torge/itd/ (author: Torge Martin)
+     The code implements concept laid out in Thorndike et al. (1975);
+     code is enabled via CPP flag SEAICE_ITD
+     nITD (in SEAICE_SIZE.h) defines number of ice thickness categories;
+     code is not complete yet!!
+   - SEAICE_SIZE.h now included in almost all seaice routines
+ o verification (using seaice):
+   - switch back seaice-dynamics (+ lower SOLV_MAX_ITERS) in ADM exp.
+     global_ocean.cs32x15.seaice ; update results.
+   - compile B-grid dynamics in FW test exp 1D_ocean_ice_column ;
+   - compile C-grid dynamics with #define SEAICE_ALLOW_JFNK in FW test exp
+     offline_exf_seaice (previously compiling B-grid).
+ o pkg/exf:
+   - fix some STOP conditions in exf_check.F (from Aug 28, modifs did not allow
+     to specify neither just 1 comp of wind or wind-stress, nor no surface momentum
+     forcing): just replace CPP option ALLOW_ATM_WIND with run-time param useAtmWind.
+ o pkg/layers (adjust changes from Sept 19):
+   - do snap-shot output and fill diagnostics from inside iLa loop (layers_calc.F)
+     this allows to remove "layers_maxNum" dimension from all layers arrays.
+ o pkg/layers (adjust changes from Sept 19):
+   - remove ALLOW_LAYERS_OUTPUT ; fix snap-shot and time-ave output ;
+   - snap-shot extended to all type of layers (not just the 1rst type);
+   - remove layers variables when corresponding CPP option is undef.
+ o pkg/layers:
+   - rename pkg/layers variable and add new output (layer exist & un-weighted
+     velocity in layer)
+ o pkg/seaice:
+   - simplify (?) ocean-drag coefficent computations by using
+     the same routine in all three solvers (saves some code lines)
+   - remove global fields DRAGA and DRAGS from C-grid code and
+     declare them locally in lsr.F (the only place where they are
+     still used)
+   - update AD output of lab_sea.evp (very sensitive anyway).
+ o pkg/seaice: add Jacobian-free Newton Krylov solver for ice dynamics
+   (Lemieux et al. 2010, 2012). Turn on with the usual SEAICE_ALLOW_JFNK
+   and SEAICEuseJFNK=.true. A few things to note:
+   - involves a FGMRES, that is parallel but very inefficient,
+     because of many scalar products (global sums) in the Gram-Schmidt
+     orthogonalization method. Needs to be replaced. Original code
+     from J.-F. Lemieux
+   - preconditioner for FGMRES is a stripped down version of LSOR
+   - SOLV_MAX_ITERS is now used for LSOR as a solver and as a
+     preconditioner. For the preconditioner, the default is set to 10.
+   - Jacobian times vector is computed with finite differences
+   - marginally related to JFNK-solver: add a smooth regularization for
+     zeta with tanh that will improve convergence (Lemieux and Tremblay,
+) for any implicit solver (not implemented for EVP because EVP
+     does not need this regularization in the first place). Define
+     SEAICE_ZETA_SMOOTHREG in SEAICE_OPTIONS.h to use.
+ o eesupp/src:
+   - check in genmake2 that intrinsic S/R flush is available.
+   - add S/R to flush IO unit (if intrinsic S/R flush is available)
+   - flush standard & error msg unit before MPI termination
+   - if debugMode, flush IO unit after printing msg
+ o pkg/ctrl:
+   - ctrl_unpack.F, ALLOW_GENARR3D_CONTROL code: fix missing argument in call
+     to ctrl_set_unpack_xyz.
+ checkpoint64 (2012/10/09)
+ o pkg/shelfice
+   - in mom_fluxform.F, mom_vecinv.F:
+     CALL SHELFICE_V_DRAG(bi,bj,k,vFld,KE,KappaRU,vF,myThid)
+     Bug fix KappaRU -> KappaRV
+     does not change verification/isomip but may change other setups
+     (presumably constant KappaRU=KappaRV)
+   - fix diagnostics SHIU/Vdrag (thanks to Tom Millgate)
+ o pkg/obcs:
+   - fixed some indexing bugs in obcs_seaice_sponge.F
+   - added obcs relaxation subroutines for HSALT and HSNOW
+   - changes verification/seaice_obcs/results/obcs_seaice_sponge.F
+ o pkg/seaice:
+   - add "multicategory" parameterization for snow in analogy to ice,
+     default is off for now.
+ o pkg/obcs:
+   - added obcs_seaice_sponge.F for obcs relaxation of seaice variables;
+     see verification/seaice_obcs/input.seaiceSponge for example application.
+   - remove local commom bloc "OBCS_GLOBAL" in obcs_readparms.F and do all the OB
+     index setting by master-thread. This fix multi-threads Pb in previous modifs.
+ o pkg/layers :
+   - add diagnostics to pkg/layers
+   - move the meat of pkg/layers from layers_calc.F to layers_fluxcalc.F
+     (from R.Tulloch). Layers_calc.F now calls layers_fluxcalc.F accordingly.
+ o pkg/generic_advdiff/gad_implicit_r.F :
+   - fix ADVr diagnostics in case of both implicit vertical advection and diffusion.
+ o pkg/seaice/seaice_growth.F:
+   - fix SItflux diagnostics in virtual salt flux + balanceEmpmr case.
+ o pkg/obcs:
+   - change default setting of OBCS_UVICE_OLD from defined to undef;
+   - use new parameter OB_indexNone for null index value (instead of hard-coded 0)
+     in all pkg/obcs code and in other pkgs; remove k loop in obcs_check_depths.F;
+   - pass OB_indexNone as (new) argument to S/R CTRL_MASK_SET_[X,Y]Z;
+   - change OB null index value (OB_indexNone) to -99 ; this fix the problem
+     with Southern & Western OB at a tile edge (at least in a simple set-up).
+ o pkg/obcs:
+   - change settings of OB index in case OB coincides with tile edge (shared by
+tiles), so that common OB location is registered by both tiles (instead of
+     only 1). However, for Southern and Western OB, index value = 0 is not
+     recognized as valid OB index (=default null value) and needs to be fixed.
+   - modify accordingly OBCS_BALANCE_FLOW and OBCS_MONITOR (avoid double counting)
+   - new parameter "OB_indexNone" for null index value (for now, still zero)
+     to replace hard-coded null index value of zero.
+ o pkg/exch2:
+   - improve W2_USE_E2_SAFEMODE (faster) and W2_E2_DEBUG_ON:
+     always check buffer-size (but outside the loop); move checking for valid
+     index from W2_USE_E2_SAFEMODE to W2_E2_DEBUG_ON; in W2_E2_DEBUG_ON,
+     print each tile and point connection only if |W2_printMsg|>= 2 and 3.
+ o pkg/ctrl (pack & unpack):
+   - in ctrl_pack.F & ctrl_unpack.F, use the same local file-name variable
+     (locally defined) for different variables (+ remove the variable-specific
+     file name in CTRL_GENARR.h). For now, only implemented for GENARR2/3D_CONTROL
+     (to be extended to other local file names in ctrl.h).
+ o pkg/flt:
+   - add a FLT_Iter0 option (similar to PTRACERS_Iter0).
+ o pkg/mdsio:
+   - fix missing STOP in mdsio_readvec_loc.F (case ioUnit=0) when file is missing
+ o tools/genmake2:
+   - add similar dependences for target EXE_AD & EXE_FTL as we have for EXECUTABLE
+     (added by Alistair in version 1.51 for building without make depend);
+   - remove Header files list (H_SRC_FILES) from the dependence of targets
+      ad_input_code.f & ftl_input_code.f (not clear why it was added in the first
+     place in version 1.23): this save going through staf when unrelated header
+     file has been modified.
+    Note: for an intermediate target (e.g., ad_input_code.f or adtaf) without
+     "make depend" step, still need to do "make links" before "make adtaf".
+ o eesupp/src (+ few pkg src files) & genmake2:
+   - finish to remove ALWAYS_USE_MPI in source code that TAF does not see;
+   - no longer set ALWAYS_USE_MPI in Makefile (was done by genmake2).
+   - improve genmake2 checking for ALLOW_${PKG} in CPP_OPTIONS.h files (distinguish
+      upper/lower case ; account for space between "#" and undef/define)
+ o pkg/flt (with exch2):
+   - cleaning: fix so that it compiles; move remaining MPI calls out of flt_exch2.F;
+   - simplify threads synchronisation; fix (many issues) multi-threaded with MPI.
+ checkpoint63s (2012/09/05)
+ o pkg/ecco:
+   - remove #ifdef ALLOW_SMOOTH_CORREL3D brackets.
+   - add more relevant #ifdef ALLOW_SMOOTH ones.
+   - sort out useAtmWind, useSMOOTH, ctrlSmoothCorrel2D.
+ o pkg/ctrl:
+   - CTRL_OPTIONS.h : document CPPs related to smoothing; ALLOW_SMOOTH_CORREL2D/3D,
+     ALLOW_CTRL_SMOOTH, ALLOW_SMOOTH_CTRL2D, ALLOW_SMOOTH_CTRL3D.
+   - ctrl.h : document run time params doInitXX, doMainPack, doMainUnpack, doPackDiag,
+     doSinglePrecTapelev (audodiff param!), ctrlSmoothCorrel2D (new) and
+     ctrlSmoothCorrel3D (new).
+     The added ctrlSmoothCorrel2D/3D replace the old ALLOW_SMOOTH_CORREL2D/3D CPP.
+   - ctrl_readparms.F : initialise ctrlSmoothCorrel2D/3D and read from namelist.
+   - ctrl_init.F ctrl_pack.F ctrl_unpack.F : switch off ustress/vstress
+     controls when useAtmWind, and vice versa.
+   - ctrl_map_ini_ecco.F : UVEL0, VVEL0, edtaux, edtauy cannot be smoothed as tracers.
+   - ctrl_get_gen.F : replace #ifdef ALLOW_SMOOTH_CORREL2D with
+       #ifdef ALLOW_SMOOTH, IF ctrlSmoothCorrel2D, IF useSMOOTH.
+   - ctrl_map_ini_gen.F : replace #ifdef ALLOW_SMOOTH_CORREL3D with
+       #ifdef ALLOW_SMOOTH, IF ctrlSmoothCorrel3D, IF useSMOOTH.
+   - ctrl_set_pack_xy[z].F, ctrl_set_unpack_xy[z].F:
+     replace ALLOW_SMOOTH_CORREL2D/3D brackets with ctrlSmoothCorrel2D/3D.
+ o pkg/smooth:
+   - remove un-necessary includes.
+   - remove ALLOW_SMOOTH*D and ALLOW_SMOOTH_CORREL*D brakets.
+     Those CPP options were never defined, and not necessary.
+ o model/src:
+   - fix CPP brackets in ini_mixing.F (GM_background_K belongs to gmredi).
+   - standard treatment of useSMOOTH.
+ o pkg/autodiff:
+   - add LOGICAL useGGL90inAdMode, useGGL90inFwdMode, useSALT_PLUMEinAdMode,
+     useSALT_PLUMEInFwdMode allowing to switch off ggl90 and salt_plume adjoint.
+ o pkg/exch2:
+   - add "if usingMPI" where it was missing (in exch2_rx?_cube*.template)
+     + start to remove ALWAYS_USE_MPI in source code that TAF does not see.
+   - make new S/R W2_MAP_PROCS out of w2_eeboot.F to setup exch2 CommonFlag
+     and tiles to process mapping.
+   - re-arrange 3 header files (W2_EXCH2_PARAMS.h, _BUFFER.h & _TOPOLOGY.h)
+     moving /EXCH2_FILLVAL_RX/ & /W2_EXCH2_COMMFLAG/ to W2_EXCH2_TOPOLOGY.h;
+     rename "exch2_tProc" to "W2_tileProc" and move seting of e2FillValue_RX
+     from w2_eeboot.F to w2_readparms.F.
+ o eesupp/src:
+   - set exchNeedsMemsync & exchUsesBarrier according to "usingMPI" (instead of
+     ALWAYS_USE_MPI) + moved from ini_communication_patterns.F to eeset_parms.F;
+     also move setting of exchCollectStatistics from exch_init.F to eeset_parms.F
+   - in eedie.F and all_proc_die.F, always call MPI_FINALIZE when ALLOW_USE_MPI
+     is defined (remove condition on usingMPI) to match cases where MPI_INIT
+     has been called.
+   - fix bug I put in previous modif of exch_sm_3d_rx.template (not much used);
+   - change default (non-MPI) value of myPid (from 1 to 0) to match MPI settings
+     (so that on 1 proc, get same myPid independently of usingMPI)
+   - add a stop if multi-procs but usingMPI=F ; stop also if usingMPI=T and
+     useCubedSphereExchange with EXCH-1 (safer).
+   - add "if usingMPI" where it was missing (+ start to remove ALWAYS_USE_MPI).
+ o pkg/ggl90:
+   - fix bug in filling corner mask array "mskCor" (FILL_CS_CORNER_TR_RL call)
+     used in ALLOW_GGL90_SMOOTH code.
+ o pkg/flt:
+   - fix typo in FLT_WITHOUT_Y_PERIODICITY (the effect was to ignore stopping
+     floats at the Southern end of the domain).
+ o eesupp/inc:
+   - add a list of CPP-options which can be set by Makefile (DEF_IN_MAKEFILE.h);
+     but not used (and not to be used) anywhere, just for documentation.
+ o pkg/autodiff, exf, ptracers & seaice (AD & TL output):
+   - comment out the very nasty "writeBinaryPrec = writeStatePrec" line, since:
+     a) can damage previously written records in any other multi-record files.
+     b) if needed, can easily do it cleanly, by calling S/R WRITE_REC_3D_RL/S.
+ o tools/genmake2:
+   - define variable MAKE within Makefile and use it in place of 'make';
+   - update AD_CONFIG.h (if needed) before building any of the executable
+     (forward, adjoint or tangent-lin); this involves a 2nd invocation of make;
+     and add the usual #ifndef/#define AD_CONFIG_H in AD_CONFIG.h;
+   - always print usual warning comment 'this file is automatically generated'
+     from script convert_cpp_cmd2defines (+ remove this warning from genmake2).
+ o pkg/cheapaml:
+   - updated to correspond to the code used in accepted paper (Nico Wienders).
+ o pkg/exf:
+     added run time switch useAtmWind to replace ALLOW_ATM_WIND cpp switch.
+     ALLOW_ATM_WIND now just sets the useAtmWind default (see exf_readparms.F)
+     and force defines ALLOW_BULKFORMULAE (EXF_OPTIONS.h).
+ o pkg/exf, autodiff, ctrl, ecco and seaice:
+     remove ALLOW_ATM_WIND brackets, or replace them with useAtmWind ones.
+ o pkg/ctrl, ecco:
+     allow to compile both ALLOW_U/VSTRESS_CONTROL and ALLOW_U/VWIND_CONTROL.
+     Depending on useAtmWind, one is inactive, and the other is active (see
+     exf_getffields.F/exf_getsurfacefluxes.F).
+ o tools/genmake2:
+   - improve error msg when failing in 2nd test of check_for_broken_Ff
+   - fix option '-makefile' short-name (-mf according to genmake2 -help)
+   - source local config file "genmake_local" just after processing the genmake2
+     command arguments (previously done before processing arg).
+ o pkg/grdchk:
+   - add a call to TURNOFF_MODEL_IO for Tangent-Linear run (in this case, call
+     to this routine from cost_final has been dropped in g_cost_final)
+   - improve printed information (more explicit msg, no longer using "print *,"
+      fix fcpertminus printed value).
+ o model/src:
+   - move call to COST_INIT_VARIA out of packages_init_variables.F directly
+     into initialise_varia.F (just after calling PACKAGES_INIT_VARIABLES):
+     this prevents getting cost-funct reset in adinitialise_varia recomputations.
+ o pkg/dic:
+   - move initialisation of "freefe" array from from dic_biotic_forcing.F to
+     fe_chem.F: this prevents TAF from dropping this initialisation in TLM code.
+ o pkg/grdchk:
+   - grdchk_main.F : added CALL GLOBAL_SUM_INT( ierr , myThid )
+   - grdchk_getadxx.F etc. : omit I/O if ierr.EQ.0
+ o pkg/autodiff/ctrl/grdchk :
+   - attempt to sort out what works and what does not,
+     with regard to I/O, and to warn/stop accordingly.
+ o pkg/grdchk:
+   - attempt to fix grdchk in the case of useSingleCpuIO.
+   - "if ( myProcId .EQ. grdchkwhichproc .AND. ierr .EQ. 0 )"
+    statements were moved from grdchk_main.F and into
+    grdchk_getadxx.F grdchk_getxx.F grdchk_setxx.F.
+   - a global sum is applied to record numbers icvrec/layer
+    out of grdchk_loc so that they be passed to I/O routines.
+ o pkg/smooth:
+   - fix recomputation that appeared with nlfs : use smooth_recip_hFacC,
+     smooth_hFacW, smooth_hFacS (copied at init_fixed) in 3d case.
+ o verification/testreport:
+   - add option '-tlm' for Tangent-Linear test (-adm,-oad,-tlm are all exclusive);
+   - can also use compressed (gzip) reference output file;
+   - change format (in pkg/grdchk) of TLM output (+ add forward gradient)
+     to be easier to collect by testreport.
+   - update existing TLM output (half out-of-date by more than 3 yrs).
+   - report NETCDF & LAPACK settings (from genmake2) in output dir.
+   - report run-time in each individual summary (previously only for AD test);
+     for TLM test, add also TAF version.
+   - add daily TLM test on (old) aces cluster + weekly test on baudelaire.
+ checkpoint63r (2012/08/15)
+ o tools/genmake2:
+   - fix Makefile for target ftlall (+ update files to clean after make ftlall)
+ o pkg/ecco/ecco_cost_final.F :
+   - fix fc print statements (to stdout and costfunction0000) so
+     that the printed value is always after the global sum.
+ o pkg/seaice/seaice_dynsolver.F :
+   - fix ice strength assymptote at SEAICE_area_max<1
+     (no change for the standard case of SEAICE_area_max=1)
+ o some cleaning:
+   - pkg source files: ensure that all *.F files from each pkg included the
+     corresponding ${PKG}_OPTIONS.h file (except stand-alone src file which
+     only includes CPP_EEOPTIONS.h); fix S/R CTRL_SMOOTH ; update AD experiment
+     code_ad/*.F src files; add new option-file in pkg/admtlm + corresponding
+     includes;
+   - model/src: add PACKAGES_CONFIG.h wherever ALLOW_AUTODIFF[_TAMC] is used.
+   - ALLOW_DIFFKR_CONTROL: add a stop in S/R CTRL_CHECK in case ALLOW_3D_DIFFKR
+     is undef; also define /DYNVARS_DIFFKR/ common block in DYNVARS.h when
+     ALLOW_DIFFKR_CONTROL is defined, to allow to compile and reach this stop.
+   - update option-file CPP_OPTIONS.h of all AD experiments:
+     * no longer include PACKAGES_CONFIG.h ;
+     * includes ECCO_CPPOPTIONS.h if PACKAGES_CONFIG.h has been included ;
+     * def/undef ALLOW_3D_DIFFKR independently of ALLOW_DIFFKR_CONTROL (before
+       including ECCO_CPPOPTIONS.h).
+ o pkg/cost, pkg/ctrl, pkg/ecco option-file:
+   - clean-up and split content of old pkg/ecco/ECCO_CPPOPTIONS.h file into
+     separated pkg option-file (done according to old doc from ECCO_CPPOPTIONS.h,
+     not necessary accurate).
+   - add a template for option-file ECCO_CPPOPTIONS.h, mostly empty, in
+     pkg/autodiff, i.e., the 1rst pkg to compile for adjoint built, with lines to
+     deliberately break compilation (a remainder that it needs to be customized)
+   - in pkg/ecco, includes ECCO_OPTIONS.h instead of COST_OPTIONS.h
+   - rename COST_CPPOPTIONS.h to COST_OPTIONS.h
+   - rename CTRL_CPPOPTIONS.h to CTRL_OPTIONS.h
+ o tools/genamke2:
+   - check for lapack.
+ o pkg/cost and pkg/ecco : attempt to sort out some of the limiting intricacies.
+   - pkg/cost.cost_final.F : allow for use of pkg/ecco and pkg/cost cost functions
+     jointly. The exclusive ifdefs were removed, to add costs terms (when defined)
+     from both packages.
+   - the fc global sum in pkg/ecco/ecco_cost_final.F was removed accordingly.
+   - for objf_atl we use either the pkg/ecco or the pkg/cost term depending on CPPs.
+   - pkg/ecco and model/src : add CPP brackets around pkg/cost and pkg/ctrl includes
+     of "CTRL_SIZE.h" "ctrl.h" "ctrl_dummy.h" "optim.h" / "cost.h" accordingly.
+ o pkg/cost : add comments to explain special and/or untested setups.
+ o pkg/exf:
+   - use EXF_OPTIONS.h to set pkg/exf options except if done in ECCO_CPPOPTIONS.h
+     (previously, ALLOW_AUTODIFF_TAMC was controling this switch).
+ o verification/*/code_ad:
+   mimimal cleaning of AD experiments ECCO_CPPOPTIONS.h option-file:
+   - reccord when this file is included (define ECCO_CPPOPTIONS_H)
+   - remove the most obvious obsolete features (e.g., #define ALLOW_COST not
+     allowed since Oct 2003 in any option-file except in PACKAGES_CONFIG.h)
+ o pkg/seaice :
+   - added possibility to change ice strength/PRESS0 relationship to
+     HEFF, according to the following run time parameters
+     SEAICEpresPow0 :: HEFF exponent for ice strength below SEAICEpresH0 (integer, >0)
+     SEAICEpresPow1 :: HEFF exponent for ice strength above SEAICEpresH0 (integer, >0)
+     SEAICEpresH0   :: HEFF threshold for ice strength            (m)
+ o pkg/ggl90 :
+   - added run time flag mxlSurfFlag to include the code that ensure
+     mixing between first and second level (previously included as a comment)
+ o verification/1D_ocean_ice_column/input_ad/data.autodiff :
+   - add test of newly added dumpAdByRec=T option where
+     we write all records to one file per variable.
+ o verification/global_ocean.cs32x15/code_ad/CPP_OPTIONS.h :
+   - switch to #define ALLOW_BALANCE_RELAX and ALLOW_BALANCE_FLUXES
+     to check that this code is ok with taf and compiles in adjoint.
+ o pkg/autodiff :
+   - added run time param dumpAdByRec : ad dump format switch.
+     If true then write all records to one file per variable.
+     Else write one file per record (remains the default).
+   - revise seaice_ad_dump.F and exf_adjoint_snapshots_ad.F accordingly.
+ o pkg/seaice:
+  - Added SEAICEuseTILT run time switch : if set to
+    false then omit the tilt term in seaice dynamics.
+  - Fix free drift calculation.
+ o pkg/shelfice:
+   When initializing SHELFICEDragQuadratic, set default to be
+   consistent with shiCdrag in case SHELFICEuseGammaFrict is used,
+   but retain option to set it independently
+   (inconsistenty spotted by Veronique Dansereau)
+ o eesupp/inc:
+   - in EEPARAMS.h, add real-type constant for some frequently used simple number
+      (0,1,2,1/2), with name explicitly referring to RS/RL type.
+ o model/src:
+   - move balancing of relaxation terms to new S/R balance_relax.F.
+ o pkg/autodiff:
+   re-write active I/O high-level (control) S/R:
+   - rename  S/R ACTIVE_READ/WRITE_RL to ACTIVE_READ/WRITE_3D_RL
+   - add 1 more argument (useCurrentDir) to replace the "_LOC" 2nd set of S/R.
+   - use standard pkg/mdsio I/O routines (MDS_READ/WRITE_SEC_XZ/YZ  and
+     MDS_READ/WRITE_FIELD); change loops to multi-threads.
+   - update and merge active_file_control_slice.flow into active_file_control.flow
+   - update the calls in lower level S/R (active_file.F, active_file_g.F and
+     active_file_ad.F) keeping the argument list and function unchanged.
+   - also update lower-level "_LOC" version (call same S/R with "useCurrentDir
+     =.TRUE.") and remove high-level (control) _loc version (not called anymore).
+   - new low-level active I/O routines, one for each type (RL/RS), for active var
+     of various (XY,XZ,YZ) shape and level number (arguments: arrShape, myNr);
+     fix ctrl_init_wet.F & ecco_cost_weights.F by calling the new S/R with the
+     right type.
+ o autodiff and RS=real*4:
+   - call the right type (_RS instead of _RL) of S/R in few output S/R (pkg/exf
+     ad-monitor and snapshots); disable arrType='RS' in mdsio_gl*.F ;
+   - change argument type of 3-D mask argument to _RS to match type in the call
+     (in seaice_cost*.F, ctrl_*_gen.F and *ctrl_bound.F); to be continued.
+ o pkg/thsice:
+   - re-anable balanceEmPmR when useSEAICE=T with useThSIce=T.
+   - option to correct ocean fresh-water flux for imbalance of Atmos+Land
+     fresh-water flux: uniform correction or proportional to local precip.
+ o pkg/ctrl:
+   - new header file CTRL_SIZE.h for parameters maxCtrlArr2D, maxCtrlArr3D
+   - redefine CPP option ALLOW_BOTTOMDRAG_CONTROL to
+                         ALLOW_BOTTOMDRAG_CONTROL_NONGENERIC
+   - verification/hs94.1x64x5/ tests ALLOW_GENARR{2D,3D}_CONTROL
+ checkpoint63q (2012/07/30)
+ o pkg/autodiff:
+   note about monitor and snap-shot of ad-variables:
+   a) need to apply ADEXCH before monitor or output of ad-vars to include
+    overlap contributions (was done for adjDump but missing for monitor).
+   b) since ADEXCH implies adding overlap values to interior array, machine
+    truncation error is expected when adding an ADEXCH call in the middle of
+    the time-stepping (although mathematically identical).
+   modifs:
+   - fix some incorrect type (RL/RS, UV/scalar) in ADEXCH calls and ad-vars
+     declaration (adEddyPsiX,adEddyPsiY in adcommon.h).
+   - add new run-time params (dumpAdVarExch & mon_AdVarExch) to select how  to
+     apply ADEXCH before monitor or snap-shot of ad-variables:
+        =0 : no ADEXCH ; =1 : do ADEXCH ; =2 : apply ADEXCH on a local copy.
+   - implement new method (copy+adexch) for snap-shot and monitor of main model
+     ad-vars (initially not used by default -> output unchanged).
+   - change default (set to 2) to use new method and update few output_adm.txt
+     with accurate ad-monitor (global_ocean.90x40x15, tutorial_global_oce_biogeo
+     and both tutorial_tracer_adjsens tests).
+   - switch 2 global_ocean.cs32x15 AD-tests to AB-2 (seaice_dynmix & thsice)
+     and turn off momDissip_In_AB in the 2 other (needed for stable AB-3).
+ o pkg/ctrl:
+   enable the use of a variable number (maxCtrlArr2D, maxCtrlArr3D) of
+   generic control variables via
+   #define ALLOW_GENARR2D_CONTROL and/or #define ALLOW_GENARR3D_CONTROL
+   Only required customization should be S/R ctrl_map_ini_genarr.F
+   (routine in repository contains example)
+ o pkg/exf:
+   - fix and refine checking of surface-relaxation setting when using EXF
+ o verification (adjoint exp):
+   - reduce length of simulation by half for experiment global_ocean.cs32x15
+     (std, seaice & seaice_dynmix) and exp tutorial_dic_adjoffline; update output.
+ o pkg/mom_common (mom_u/v_bottomdrag), pkg/shelfice (shelfice_u/v_drag)
+   - replace if statements KE.ne.0 with KE.gt.0 to avoid sqrt of negative numbers
+     of KE that can occur with aggressive optimization
+   + put quadratic bottom drag calculation in separated loops (only done if
+     using bottomDragQuadratic)
+ o model/src: CG2D_NSA
+   - clean-up:  stop if cg2dNormaliseRHS=T and AUTODIFF
+      and replace GLOBAL_SUM calls with GLOBAL_SUM_TILE.
+   - in test-exp that uses CG2D_NSA (bottom_ctrl & tutorial_tracer_adjsens),
+      change cg2d residual target to be expressed in Wunits (=> do not normalise
+      RHS ; this fix global_max Pb with TAF); update output.
+ o verification/tutorial_tracer_adjsens:
+    improve parameter consistency (and get rid of warnings):
+    - use deltaTFreeSurf=deltaTtracer (better with NonLin FreeSurf);
+    - switch Temp Adv Scheme from 81 to 80 (no limiter since theta < 0 is physical)
+    - use staggerTimeStep (for stability) in som81; use default rotation period.
+ o pkg/exch2:
+   - with empty facet: fix compact-format (W2_mapIO=1) definition (was previously
+     reset to 0 = 1 long line in X)
+ o pkg/mdsio:
+   - fix reading of dimensions from meta file for large-size domain
+ o model/src:
+   - fix saltIsActiveTr setting for IdealGas eosType (eosType is 6 character long);
+   - to refine CS-grid check, add logical flag "hasWetCSCorners": true if using
+     Cubed-Sphere Exch with CS-corners inside the domain;
+     make new S/R INI_GLOBAL_DOMAIN from code in ini_linear_phisurf.F to calculate
+     globalArea and to set hasWetCSCorners.
+   - add warning if usingCurvilinearGrid and momAdvection in flux-form (missing
+     metric terms); stop if hasWetCSCorners=T and momAdvection in flux-form.
+   - re-activate the stop if useCDscheme and hasWetCSCorners=T (previously if
+     useCDscheme and useCubedSphereExchange).
+ o pkg/seaice/seaice_growth.F :
+   - compute the SEAICE_DISABLE_HEATCONSFIX term accordingly
+     for the (.NOT.useRealFreshWaterFlux).OR.(nonlinFreeSurf.EQ.0)
+     when the previous code was not correct.
+   - in all cases diagnoze the boundary condition mismatch to SIaaflux
+   - in the case of useRealFreshWaterFlux.AND.(nonlinFreeSurf.GT.0) add
+     that term to QNET (essentially to set the melt/freeze water to 0degC).
+     when SEAICEheatConsFix is true, so that the ocean+ice budget heat is closed.
+ o verification/global_ocean.cs32x15/input.seaice :
+   - add SEAICEheatConsFix in data.seaice, ensuring closed ocean+ice heat budget.
+   - add diagnostics (commented out) for budget test using my matlab codes (gcmfaces).
+   - update results (output.seaice.txt) accordingly.
+ o verification/lab_sea/input/data.seaice :
+   - remove SEAICEheatConsFix, which is now be tested
+     in global_ocean.cs32x15. The presently coded fix
+     is only consistent with real fresh water + nlfs.
+   - update results (output.txt) accordingly.
+ o pkg/salt_plume: added diagnotic for salt tendency (oceSPtnd).
+ o AD_CONFIG.h file:
+   - in genmake2: remove "#undef ALLOW_ECCO_OPTIMIZATION" from AD_CONFIG.h;
+   - remove #include "AD_CONFIG.h" from all included OPTIONS files and
+     add it explicitly in each fortran src file where it is needed.
+     motivation: header file AD_CONFIG.h is generated/modified after "make depend"
+     thus introducing potentially wrong dependency; therefore, better to include
+     it only where it's really needed, and after any other included OPTIONS file
+     (less tempting to bring conditional includes according to ALLOW_ADJOINT_RUN
+     or ALLOW_TANGENTLINEAR_RUN).
+ checkpoint63p (2012/07/06)
+ o pkg/autodiff:
+   - rename S/R INI_AUTODIFF to AUTODIFF_INIT_VARIA ;
+   - create new header file "AUTODIFF_PARAMS.h" for pkg/autodiff parameters
+     which are now read from new parameter file "data.autodiff" (inAdExact
+     previously in "data", use{KPP/GMRedi/SEAICE}inAdMode previously in data.pkg)
+   - add file "data.autodiff" in all verification/*/input_ad/ directories.
+   - add run-time parameter to turn On/Off SEAICEuseFREEDRIFT in adjoint/forward
+     mode (used in global_ocean.cs32x15.seaice_dynmix test exp.)
+ o verification/tutorial_tracer_adjsens/
+   - add extra sub-verification which uses "SOM" advection scheme
+     (2nd Order-Moment Advection Scheme, Prather Limiter) with
+       #define GAD_ALLOW_TS_SOM_ADV in GAD_OPTIONS.h
+     and in data:
+       multiDimAdvection=.TRUE.,
+       tempAdvScheme=81,
+       saltAdvScheme=81,
+ o model/src:
+   - introduce ALLOW_BALANCE_RELAX which allow the removal
+    of the global mean of relaxation terms by setting
+    balanceThetaClimRelax and balanceSaltClimRelax
+   - disable balanceEmPmR and balanceQnet in the case when useSeaice.
+    This case is now treated appropriately in seaice_growth.F
+ o pkg/seaice:
+   - do balanceEmPmR and balanceQnet based on the net fluxes
+     (SItflux) that enter the ocean+ice system rather than QNET
+     and EMPMR. Works best in real fresh water.
+   - SIatmFW, SIatmQnet, and SItflux computations had to be moved
+     out of the diagnotics bloc, and stored in global arrays.
+ checkpoint63o (2012/06/29)
+ o vertical mixing schemes:
+   - remove unused S/R CALC_BUOYANCY (left from branch-atmos merging)
+   - replace computation of density (in Function STATE1, opps_calc.F) by a call
+     to S/R FIND_RHO_SCALAR
+   - pass sigmaR to S/R PP81_CALC, MY82_CALC (but not yet used) and to GGL90_CALC
+     and use it for N^2 calculation in ggl90_calc.F (save 2 density computations);
+     affects output (vermix.ggl90) at truncation level.
+ o testreport:
+   - change adjustment of SIZE.h for mpi+mth testing: preserve enough tiles
+     (nSx,nSy) for the number of threads (from eedata.mth)
+ o model/src:
+   - remove 2nd set of calls at the top of initialise_varia.F (Adjoint part)
+     related to Non_Lin Free-Surf or Bottom-Control (but not longer necessary).
+ o verification/tutorial_tracer_adjsens/
+   - compile with ALLOW_CG2D_NSA
+   - run with nonlinFreeSurf=3
+   - update reference output_adm.txt
+ o tools/genmake2:
+   - add "-DHAVE_NETCDF" to the DEFINES list when NetCDF is available ;
+     refine usePROFILES switching off (only when NetCDF is not available).
+ o verification (atmospheric set-up):
+   - change eosType='IDEALGAS' to eosType='IDEALG' to match variable declaration
+ o pkg/profiles : refine profiles and files handling.
+ o model/src and pkg/ecco : introduce run-time switch usePROFILES.
+ o model/src/the_main_loop.F, forward_step.F and pkg/exf/EXF_OPTIONS.h :
+   - changes to use model/src/the_main_loop.F rather than the ecco version
+     in ecco type adjoint runs.
+ o model/src:
+   - move computation of recip of grid distance & area from INI_MASKS_ETC to INI_GRID
+   - move setting of h0Fac[C,W,S] from INI_LINEAR_PHISURF to INI_MASKS_ETC
+   - update_masks_etc.F: rename SMOOTH*_R4,R8 function to the corresponding type (RS,RL)
+ o model/src:
+   - fix S/R UPDATE_CG2D for ALLOW_DEPTH_CONTROL case (was empty before);
+     update output of test experiment bottom_ctrl_5x5.
+ o pkg/generic_advdiff:
+   - implement vertical bi-harmonic diffusion (for now, only for T & S and
+     only explicitly).
+ o verification/bottom_ctrl_5x5/
+   update reference output (results changed quite some time ago,
+   not sure when; but new reference results look ok in terms of grdchk)
+ o verification/1D_ocean_ice_column/
+   For verification purposes, the exact adjoint rather than an approx.
+   should be used (e.g., to comare against F.D. or TLM).
+   removed autodiff_inadmode*_ad.F routines in code_ad/
+   Update results/ accordingly.
+ o pkg/cal:
+   - change cal_getdate.F so that output date is function of input time only
+     (less ambiguous, not mixed up with input iteration number).
+   - fix calendarDumps for non-zero phase-lag (S/R CAL_TIME2DUMP).
+ o pkg/diagnostics:
+   - implement calendarDumps also for stats-diags
+   - implement calendarDumps also for snap-shot output (negative freq)
+   - for now, ignores calendarDumps if non-zero phase-lag.
+ checkpoint63n (2012/06/04)
+ o model/src:
+   - recompute rSurfW & S to ensure consistent column thickness (needed for rStar)
+     between Sum_k(hFac*drF) and rSurf-rLow, for now only when using pkg/shelfice;
+   - use h0FacC, W & S to compute hFac_surfC, W & S in calc_surf_dr.F (more
+     similar to calc_r_star.F); update results of experiment internal_wave and
+     tutorial_global_oce_in_p (affected @ truncation level).
+ o pkg/shelfice:
+   - add parameterisation of advective-diffusive flux into the ice shelf
+     according to Holland and Jenkins (1999), eq.22-33, as suggested by Jan De Ryd
+   - simply eps3/3a computation
+ o eesupp:
+  - add new CPP option (DISCONNECTED_TILES) to disconnect tiles (no exchange
+    between tiles, just fill-in edges assuming locally periodic subdomain) and
+    add corresponding exchange subroutines (EXCH0);
+  - new CG-solver version (_EX0) for disconnected-tiles special case.
+ o model/src (CG-solvers):
+  - modify Single-Reduction version (CG2D_SR) in case cg2dMaxIters is reached
+    (similar final residual output and max-Iter number as with standard version);
+  - allows to store and use lowest-residual solution (standard & _SR versions);
+  - cleaning up (remove old, commented out code, LETS_MAKE_JAM ...).
+  - by default, also compile CG2D_SR version (define ALLOW_SRCG in CPP_OPTIONS.h)
+ o eesup/src:
+  - global_vec_sum.F cleaning: add a BARRIER ; update comments ; remove ndef
+    ALWAYS_USE_MPI (no longer needed after fixing usingMPI settings - March 2012)
+ o pkg/salt_plume added to lab_sea/input_ad.noseaicedyn
+ checkpoint63m (2012/04/27)
+ o pkg/shelfice:
+  - account for partical cells in surface level below ice-shelf for hydrostatic
+    pressure calculion (set uniformFreeSurfLev to F); update isomip experiments.
+ o ad test experiments:
+  - update and rename to "ad_optfile.local" local AD-optfile specific to a
+    particular adjoint verification experiment (in verification/*/code_ad/)
+ o pkg/seaice & pkg/exf:
+  - Part two of ECCO-CLIVAR code merges.
+    Completes merge of seaice area relax. code.
+    Requires unified CPP option EXF_ALLOW_SEAICE_RELAX
+    to be set in EXF_OPTIONS.h since this pkg controls its I/O
+    (and avoids second CPP option in SEAICE_OPTIONS.h)
+  - change default value of costIceStart & costIceEnd to a valid date.
+  - add snowPrecip to HSNOW in seaice_growth
+ o pkg/ptracers:
+  - move ptracers summary and setup check into separated S/R ; add a check for
+    valid PTRACERS_Iter0 value (error+stop or just warning).
+ o pkg/cal (+ pkg/ecco):
+  - avoid calling a S/R with 2 times the same arg (FWD: unless both are only used
+    as input; and for AD, unless both are not differentiable (e.g., k index)).
+ o model/src:
+  - define internal flag "uniformFreeSurfLev" (=T when free-surface level-index
+    is everywhere k=1) to speed-up some calculations (by pass kSurf reference);
+    temporary set to usingZCoords value (to be changed to F when using shelfice).
+  - hydrostatic pressure: implement partial cell near the surface also for
+    Z-coordinates (for the case where uniformFreeSurfLev=F); replace test on
+    usingZCoords with test on uniformFreeSurfLev where needed (in NonHyd code).
+ o pkg/ctrl/ctrl_init.F:
+  - add a formal parameter to s/r ctrl_init_rec to print
+    xx_$(ctrl_valiable)_file for easier debugging
+  - move call of cal_* routines into the if-block where they are really
+    needed so that xx_$(ctrl_variable)_period can be 0 or -12 without having
+    to specify a startdate
+ o pkg/seaice:
+  - update comments in SEAICE_OPTIONS.h (+ similar update of lab_sea/code and
+    global_ocean.cs32x15/code versions).
+  - turn on seaice Multi-category (in data.seaice, SEAICE_multDim=7) for
+    verification experiment global_ocean.cs32x15.seaice and update results.
+ o pkg/exf:
+  - new S/R EXF_GETFIELD_START to return starting-time of a forcing field
+    (according to useExfYearlyFields).
+ o pkg/cal:
+  - move calendar setting & summary (previously in cal_readparams.F) into new
+    S/R CAL_INIT_FIXED to be called later in the initialisation process, once
+    length of the simulation is set (after SET_PARMS call); This is an attempt
+    to fix Pb when, e.g.: pkg/longstep, modifies the length of the run.
+  - For safety: keep a record of pkg/cal parameter settings status
+            to allow to STOP if one pkg/cal S/R is called too early.
+  - add a stop in all basic pkg/cal subroutines if called before setting is done.
+  - modify cal_getdate.F: stop when nothing was returned;
+    if called with myIter=-1, simply retrun modelBaseDate (1,2 = startDate_1,_2);
+    this allows to remove "cal.h" from seaice_read_parms.F & init_mnc_vars.F.
+ checkpoint63l (2012/04/04)
+ o pkg/bbl:
+   - fix call to FIND_RHO_2D in bbl_calc_rho.F (case multi-tiles per proc);
+     update global_with_exf output.yearly.txt file.
+ o pkg/cal:
+   - start to clean-up cal_set.F ; fix for the case where baseTime is non-zero.
+   - remove 2 unsused and very short (1 line only) functions ;
+   - remove unsused subroutines from AD-Diff list.
+ o model/src:
+   - start to implement clean wait to stop in initialization S/R (config_check.F,
+      packages_check.F, ini_parms.F and pkg/obcs/obcs_check.F + pkg/mypackage)
+ o folowing PRINT_MESSAGE changes:
+   - remove reminder multiple print to the same file (STDOUT) when multi-threads.
+ o pkg/bbl:
+   - modification so it can work with z*
+   - replace deltaT with dTtracerLev(k) for asynchronous time stepping
+   - global_with_exf/input.yearly verification; changes output.yearly.txt
+ o eesupp/src:
+   - PRINT_MESSAGE: use OpenMP critical instruction (similar to PRINT_ERROR);
+     writing to unit 0 (if unit=errorMessageUnit) extended to the case myThid=1
+   - CHECK_THREADS: specific code if using OpenMP threading: improve checking of
+     # of threads across processors (e.g., different env OMP_NUM_THREADS setting)
+   - improve special preliminary call to EESET_PARMS (if eedata is read 2 times).
+   - when using MPI, always set usingMPI=T ; set default accordingly and stop
+     if not consistent.
+   - ALL_PROC_DIE: add a BARRIER after MPI_FINALIZE call ; skip this when thread
+     argument is zero (in case called within single-thread section).
+ o pkg/fizhi:
+     clean-up turbulence cold-start switch: decided in fizhi_init_vars.F, stored
+     in common bloc (fizhi_coms.h) and then passed as argument up to S/R TURBIO.
+ o pkg/exch2:
+   - add argument "updateCorners" to S/R exch2_get_uv_bounds (enable to
+     activate EXCH_IGNORE_CORNERS in vector EXCH S/R).
+   - switch 1rst EXCH call to IGNORE_CORNERS (instead of UPDATE_CORNERS)
+     but keep the 2nd with UPDATE_CORNERS: this prevents overwriting good data
+     with bad ones coming from a not-yet-updated halo.
+     This should fix the problem when sNx <> sNy and GCD(sNx,sNy) < 2*Olx.
+ o pkg/frazil:
+     move FrzForcT diag from frazil_diagnostics_state.F to frazil_calc_rhs.F
+     http://mitgcm.org/pipermail/mitgcm-devel/2012-March/005384.html
+ o model/src/config_check.F: add a check for OLx>sNx/OLy>sNy
+ o verification/lab_sea
+   * #undef SEAICE_EXCLUDE_FOR_EXACT_AD_TESTING
+   * #define ALLOW_SST_CONTROL & ALLOW_SST_CONTROL
+   * nTimeSteps 3 -> 4
+   * changed reference output accordingly
+ o pkg/ctrl:
+   * fix ctrl_get_gen for xx_sst, xx_sss
+ o pkg/fizhi:
+   - fix 2 calls to S/R GRD2MSC (argument igrd) in update_earth_exports.F
+     update results of exp. fizhi-cs-32x32x40 (fail with only 6 digits for cg2d)
+   - by default, use new version of S/R GETPWHERE (#define TRY_NEW_GETPWHERE);
+     fix few out-of-bounds indices in referencing vars (initialise igrd to 1);
+     clean-up fizhi_turb.F (remove unused & uninitialised qdiaglsm array).
+ o pkg/gmredi:
+   - add diagnostic of Redi (main diagnonal) vertical diffusive flux of Temp
+ o pkg/fizhi:
+   - fix few initialisation and multi-tile Pb: aqualev & gridalt now pass the
+     (old)aces open64 tuv test.
+ o pkg/icefront: fix bug and reorder loop in icefront_init_varia.F
+ o pkg/mom_vecinv:
+   - fix 1 loop range in mom_vecinv.F to be like all the other loops which
+     set/update gu,gv/Diss (fix Pb of uninitialised fVerUkp in admom_vecinv
+     with non-lin free-surf).
+ o model/src: move k-loop outside of i/j-loops when (re-)computing R_low
+   in ini/update_masks_etc.F in order to avoid -O3 optimization problems with
+   some compilers (gfortran 4.6.0 on MacOS)
+ o momentum:
+   - separate fVer?(:,:,kUp) & fVer?(:,:,kDown) in argument list of MOM_FLUXFORM
+     & MOM_VECINV subroutines (to help TAF). This fixes Pb of uninitialised
+     fVer?(kUp) in admom_fluxform with non-lin free-surf or bottom control.
+ checkpoint63k (2012/03/17)
+ o model/src:
+    - selectAddFluid (ALLOW_ADDFLUID): add missing term in horizontal momentum
+      flux-form (mom_fluxform.F) and vertical momentum (calc_gw.F) equations.
+    - SOLVE_DIAGONAL: switch default to use adjoinable & vectorized version
+      (#undef SOLVE_DIAGONAL_LOWMEMORY); update output of exp. front_relax.bvp.
+ o model/src: solve_*diagonal.F
+    - replace division with multiplication by inverse (similar to original version)
+      update output of AD exp. global_ocean.90x40x15.
+    - fix pkg/gmredi/gmredi_calc_psi_bvp.F & pkg/ggl90/ggl90_calc.F
+      to enable the use of the vectorized & differentiable solve_tridiagonal.F
+    - test exp. global_ocean.90x40x15/input_ad: switch to advection scheme 20 for
+      vertical advection (to get solve_tridiagonal tested in AD mode).
+ o pkg/seaice: ECCO-CLIVAR merge:
+. seaice AREA relaxation
+      * CPP option: SEAICE_ALLOW_AREA_RELAXATION
+      * runtime flag: SEAICE_tauAreaObsRelax
+. modified global mean cost imbalance code: CPP option
+       ALLOW_SSH_GLOBMEAN_COST_CONTRIBUTION
+ o another iteration on solve_*diagonal.F
+    Make choices independent of AUTODIFF
+    Default will be the adjoinable vectorized version.
+    Alternative choices are:
+    * non-adjoinable original version with low memory footprint:
+      #define SOLVE_DIAGONAL_LOWMEMORY
+    * still adjoinable but does not vectorize (k as inner-most loop):
+      #define SOLVE_DIAGONAL_KINNER (keeping SOLVE_DIAGONAL_LOWMEMORY undef)
+ o testreport
+  - add option to use a home made wrapper around "make"
+  - remove MITGCM_IEEE env. variable (no longer active)
+ o pkg/shelfice
+  - improve computation of friction velocity for velocity dependent
+    exchange coefficients: include velocities into SHELFICEBoundaryLayer
+    block to average velocities vertically
+  - add TAF store directives for SHI_ALLOW_GAMMAFRICT
+ o Modify diagonal solvers, now three versions (upon request):
+   #ifndef SOLVE_DIAGONAL_AUTODIFF
+. default version (dating back a while ago)
+   #else /* def SOLVE_DIAGONAL_AUTODIFF */
+   # ifdef SOLVE_DIAGONAL_KINNER
+. adjoinable version with k-innermost loop (G. Forget)
+   # else
+. adjoinable vectorized version of 2.
+   # endif
+   #endif /* SOLVE_DIAGONAL_AUTODIFF */
+   All flags are currently set within routines, but could/should be moved to CPP-options.
+   Array bounds for 1. are as before, for 2.,3. cover the entire domain
+   (could be changed for 1. too).
+ o verification/lab_sea (fwd):
+   - update the 4 fwd lab_sea test experiment: no longer SEAICE_GROWTH_LEGACY,
+     use 7 categories (except hb87), new solve4temp params (except salt_plume),
+     constant salinity (=4) or variable salinity (salt_plume) done through
+     SItracer.
+ o pkg/seaice:
+   - rename parameters: SIsalFrac to SEAICE_saltFrac & SIsal0 to SEAICE_salt0;
+   - remove old parameters ( SEAICE_freeze, SEAICEturbFluxFormula, SEAICE_gamma_t,
+      SEAICE_gamma_t_frz, SEAICE_availHeatTaper & SEAICE_availHeatFracFrz)
+     from SEAICE_PARMS.h ; still need to fix seaice_cost_sst.F (broken when
+     SEAICE_freeze got retired) but already better than previously with
+     SEAICE_freeze=123456.7 deg.C;
+   - move setting of facOpenGrow/Melt from SEAICE_INIT_FIXED to SEAICE_READPARMS
+     (safer multi-threaded setting); always set SEAICEuseEVP;
+   - setting of ocean-ice turb. flux coeff: moved from SEAICE_CHECK to
+     SEAICE_READPARMS & SEAICE_INIT_FIXED (this fixes wrong summary report);
+     stop if multiple specifications for the same coeff; make sure default
+     SEAICE_mcPheePiston is compatible with drF(1) & deltaT.
+ o pkg/obcs:
+   - allow to switch to upwind 1rst order advection scheme for the advective
+     flux computation at the open-boundary; disabled for adjoint built.
+ o pkg/ptracers:
+   - rename PTRACERS_RESTART.h -> PTRACERS_START.h
+   - rename ptracers_fields_blocking_exchanges.F -> ptracers_fields_blocking_exch.F
+   - add parameter to decide when to start a tracer; use internal flag to
+     know which tracer to step-forward; switch this internal flag at the top
+     of forward_step.F (new S/R PTRACERS_SWITCH_ONOFF); for now, not enabled
+     for adjoint built.
+ o pkg/seaice:
+   - add SEAICE_SIZE.h anywhere in the code where SEAICE.h is included ;
+   - move MULTDIM declaration and setting from SEAICE.h to SEAICE_SIZE.h ;
+   - keep experiment offline_exf_seaice truly single category (set MULTDIM=1).
+ o pkg/ecco:
+   - fix writing of output file DiagnosCost_ClimSalt/Theta
+     and DiagnosCost_DriftSalt/Theta (if multi-tiles per proc).
+ o pkg/seaice:
+   - add missing initialisation of COR_ICE array in dynsolver.F
+   - merging SEAICE_MULTICATEGORY define and undef cases. Now the same code is
+     compiled either way, and is tested in all exps (multidim was only tested
+     in lab_sea ad before).
+   - cosmetic change to prepare for future addition of ITD. no change to results.
+     no defaults change.
+   - added run time param SEAICE_multDim (7 for SEAICE_MULTICATEGORY, 1 otherwise).
+   - by lack of adequate verification experiments, I further used custom versions
+     of global_ocean.cs32x15 to test multicat or not, with pickup or not. All
+     should be correct.
+   - avoid recomputations in ad.
+ o array initialisation in adjoint mode:
+) pkg/mom_common/mom_calc_ke.F:
+     add full array initialisation of KE inside mom_calc_ke.F (ALLOW_AUTODIFF_TAMC):
+     The S/R which calls MOM_CALC_KE initialises KE but in some recomputation
+     part this initialisation is gone, resulting in Floating Point Exception
+     (caught by open64 compiler with debug option).
+) model/src/convective_weights.F
+     set output convectCount over the full array range (instead of doing
+     an update): this fix a similar issue when called within recomputation (adjoint)
+     which could by-pass the initialisation (normally done in the caller S/R).
+ o pkg/seaice:
+   - final version of turbulent flux params, as agreed at MIT ice meet:
+        SEAICE_mcPheePiston (default is ~ 0.000875)
+        SEAICE_mcPheeTaper (default is 0.)
+        SEAICE_frazilFrac (defualt is 1.)
+        SEAICE_mcPheeStepFunc (default is false)
+   - changes results at trunction error level
+   - ifdef SEAICE_EXTERNAL_FLUXES, disallow SEAICE_waterAlbedo
+ o added pkg/frazil:
+   - see frazil_description.tex for details
+   - verification experiment is global_with_exf/input.yearly; changes output.yearly.txt
+ o pkg/shelfice/shelfice_thermodynamics.F
+   - fix exponents for velocity dependent exchange coefficients: change
+     from 2/3(=0) to 0.66666666666666667
+   - move computation of velocity dependent exchange coefficients into
+     separate loop, so that it applies to both thermodynamics
+   - move some divisions by constants out of loops
+ checkpoint63j (2012/02/16)
+ o pkg/seaice:
+   - overhaul of seaice_summary.F after feb 2012 clean-up of seaice_growth.F etc.
+   - SItracer:  added run time params, and allow coupling to ocn salinity.
+ o pkg/seaice: remove (almost) all divisions by constants within loops
+   in seaice_growth.F and seaice_solve4temp.F, this changes (only) the cg2d
+   results of global_ocean.cs32x15.seaice from 16 to 11 digits (but only
+   those, caused by 1/QI -> recip_QI) -> update output.seaice.txt,
+   output_adm.seaice_dynmix.txt and also lab_sea: output_adm.evp.txt
+ o pkg/seaice :
+   - simplify McPhee tapering, and allow to use it with SEAICEturbFluxFormula
+     = 1 or 2, using newly added run time parameter SEAICE_availHeatTaper.
+   - fix d_AREAbyATM, d_AREAbyOCN, d_AREAbyICE diags I broke in r1.148.
+   - add permanent SItflux diag that corresponds to TFLUX but includes
+     ice+snow. Hence SItflux-TFLUX should match the ice+snow heat budget.
+   - allow activation/testing of a fix for suspected missing term in
+     ocn-ice heat budget (to be confirmed). To test this, you want to
+     undef SEAICE_DISABLE_HEATCONSFIX, and then set the run time param
+     SEAICEheatConsFix to .TRUE. that also allows the 'SIaaflux' diagnostic.
+   - no change in results, fwd or ad.
+ o global_ocean.cs32x15/results: 3 changes following from the pkg/seaice commit below:
+   - switch to variable freezing point.
+        Results change : cg2d -> 1 digits; ad -> 3-6-6 digits.
+   - bug fix : the sublimation term that was missing is now activated.
+        Results change : cg2d -> 2 digits; ad -> 8-6-6 digits.
+   - bug fix : flooding sign term for SIsal0.NE.0.
+        Result change : cg2d -> 8 digits; ad -> 11-12-9 digits.
+ o pkg/seaice:
+   - unified freezing point treatment : the old SEAICE_VARIABLE_FREEZING_POINT
+     is now the default, and the old default constant freezing point is recovered
+     with SEAICE_tempFrz0    = -1.96,
+          SEAICE_dTempFrz_dS = 0.,
+   - retire SEAICE_freeze (= the old way of specifycing the constant freezing point)
+   - remove ALLOW_SEAICE_FLOODING brackets; run time switch is already there.
+   - bug fix (thanks to M. Losch) : the sublimation term that was missing is now
+     activated. To reproduce old results with this bug define SEAICE_DISABLE_SUBLIM.
+   - bug fix (silly me) : flooding sign term (seaice_growth.F r 1.149line 1211)
+     was wrong for SIsal0.NE.0. Changes cs32x15 results (see above item for detail).
+   - bug fix (thanks to O. Jahn) : area loss for melting  got messed up in
+     seaice_growth r149 for legacy branch (no results change).
+   - introduce SEAICE_CAP_SUBLIM : caps sublimation heat flux in solve4temp (code
+     from I. Fenty).
+   - results did not change except for global_ocean.cs32x15, mostly due to the
+     switch to variable freezing point (see above item for detail).
+ o pkg/thsice:
+   - fix and simplify interface to salt_plume pkg ; diagnose directly amount of
+     seawater freezing in thsice_calc_thickn (not used).
+ o pkg/seaice: turbulent flux term specification via run time params.
+   - replace CPP switches with run time switches to facilitate testing
+   - retired CPPs : MCPHEE_OCEAN_ICE_HEAT_FLUX,
+                    GRADIENT_MIXED_LAYER_TURBULENCE_FACTOR
+   - added runtime parameter : SEAICEturbFluxFormula
+   - move Mcphee constants to SEAICE_PARAMS.h
+   - seaice_readparms.F : read turbulent flux term params (SEAICEturbFluxFormula;
+              SEAICE_availHeatFrac/Frz, or SEAICE_gamma_t/_frz if apply);
+              remove seaice_summary call (moved to seaice_init_fixed)
+   - seaice_init_fixed.F : set SEAICE_availHeatFrac/Frz depending on
+     SEAICEturbFluxFormula, and seaice_summary call (moved from seaice_readparms)
+   - seaice_summary.F : add missing report of read turbulent flux term set up
+                        and SITRACER.
+   - seaice_check.F : check range; inform and stop if retired CPPs are used
+                      (incl. SEAICE_AGE).
+   - seaice_growth.F : unified use of SEAICE_availHeatFrac/Frz, without
+          CPP switch, same computation as before for the different options.
+   - change results at the truncation level.
+ o pkg/seaice:
+   - remove un-used parameters LAD & MAX_TICE ; add new run-time parameters:
+     useMaykutSatVapPoly (default=F), postSolvTempIter (default=2) and
+     SEAICE_wetAlbTemp (default=-1e-3). Remove option SEAICE_SOLVE4TEMP_LEGACY.
+   - update verification/*/input*/data.seaice:
+     to reproduce previous results with former #defined SEAICE_SOLVE4TEMP_LEGACY
+     code, set useMaykutSatVapPoly=T & postSolvTempIter=0 ;
+     and to reproduce previous results with former non-SOLVE4TEMP_LEGACY code,
+     set SEAICE_wetAlbTemp=0 & SEAICE_snowThick=0.
+ o pkg/seaice/seaice_solve4temp.F (SOLVE4TEMP_LEGACY):
+   - remove LEGACY code for solving for tsurf (A1,A2,A3) but maintain the same
+     algorithm (same choice: useMaykutPolySatVap=T, postSolvTempIter=0);
+     difference in results only due to machine truncation.
+   - remove MAX_TICE (tsurf is always =< TMELT anyway); keep MIN_TICE if using
+     MaykutPolySatVap; keep MIN_LWDOWN.
+   - adapt SEAICE_MODIFY_GROWTH_ADJ code (untested) to non-legacy formulation.
+   - update output of verification exp. lab_sea (4 fwd: 11 cg2d digits except hb87,
+     + 3 AD: 6 digits except evp) and offline_exf_seaice.seaice (12 digits).
+ o pkg/salt_plume:
+   - isolate saltPlumeFlux array exch into a specific S/R called from
+     do_oceanic_phys.F
+   - add interface to pkg/salt_plume (filling of saltPlumeFlux) in pkg/thsice.
+ o verification:
+   - move untested set-up to MITgcm_contrib/verification_other.
+ o pkg/seaice:
+   - retire old way of SEAICE_AGE. Now replaced with ALLOW_SITRACER.
+ o pkg/seaice:
+   - seaice_solve4temp.F (keeping results unchanged):
+     * add 2 future run-time params to select which saturation vapor pressure
+       formula is used and how post-iteration fluxes are set.
+       Temporary set these 2 params according to option SOLVE4TEMP_LEGACY;
+     * New piece of code (not used) to update surf. atmos. heat flux F_ia using
+       the linearized expression to stay consistent with tsurf finding.
+   - seaice_freedrift.F avoid floating exception in sqrt(y) since y=sqrt(x*x)-x
+     can be < 0.
+ o pkg/seaice/seaice_solve4temp.F (SOLVE4TEMP_LEGACY undef):
+   - remove from F_ia (and from it's derivative dFiDTs1) the contribution of
+     conductive heat flux F_c , and add it explicitly when updating tsurf as
+     solution of: Fc = Fia + d/dT(Fia - Fc) *delta.tsurf
+     so that now F_ia has a consistent meaning through the entire routine.
+     This causes differences at truncation level: update output of fwd exp.
+     global_ocean.cs32x15.seaice.
+ o pkg/seaice:
+   - lots of editing/cleaning in seaice_solve4temp.F + better documentation
+     of arrays, sign/direction of fluxes; no effect on results.
+   - replace hard coded 273.16 (=previous value of celsius2K) by celsius2K
+     in seaice_budget_ocean.F & seaice_solve4temp.F (SOLVE4TEMP_LEGACY part);
+     note: this should have been done before changing celsius2K default.
+   - to keep results unchanged, add back old value of celsius2K in verification
+     exp. input*/data : lab_sea (AD), offline_exf_seaice (fwd+AD) & seaice_obcs
+   - replace hard coded seawater freezing temp in seaice_solve4temp.F (part
+     SOLVE4TEMP_LEGACY) of 271.20 (=previous value of celsius2K + default
+     value of SEAICE_freeze) by celsius2K+SEAICE_freeze so that seawater
+     freezing temp is consistent with value in seaice_growth.F ; this causes
+     differences at machine truncation level: update lab_sea AD output (3/4).
+ o pkg/seaice:
+   - mask (in exf_init_fixed.F) atemp,aqh,evap,precip,runoff,lwflx,areamask
+     and climsst/sss even when using seaice (to prevent calculation that might
+     use SST on land); does not affect any verification exp.
+   - apply mask to taux,tauy (in seaice_get_dynforcing.F); update output
+     of lab_sea.fd & lab_sea.hb87 and global_ocean.cs32x15.seaice_dynmix.
+ o pkg/seaice/seaice_growth.F: add mask to avoid non-zero ice thickness
+   over land (non-legacy code)
+ o vectorize salt_plume package:
+   - add extra code to salt_plume_frac and salt_plume_tendency_apply_s
+   - this code computes plumebk everywhere (also over land), thus requires
+     code to avoid divisions by zero and catch the case of kLev=Nr.
+   - efficiency of salt_plume_frac is still sub-optimal
+ o tools (genmake2):
+   - fix makefile NAME specification (option: -makefile NAME) by adding
+     "-f $MAKEFILE" in few places where it was missing including makedepend
+     command (contribution from Paul).
+ checkpoint63i (2012/01/24)
+ o model/src:
+   - add factorized versions of some EOS code to find_rho.F,
+     define USE_FACTORIZED_EOS to turn it on (default for TARGET_NEC_SX)
+ o model/src:
+   - add celsius2K to namelist PARM01; remove unused recip_rhoNil from PARAMS.h;
+   - change default celsius2K from 273.16 to 273.15
+   - to keep results unchanged, add back old value of celsius2K in verification
+     exp. input*/data : aim.5l_cs, 1D_ocean_ice_column, lab_sea (fwd),
+      global_ocean.cs32x15(seaice) & cpl_aim+ocn(input_atm).
+ o model/src: add a little initialisation trick to find_rho.F and find_alpha.F
+   to make TAF generate vectorizable code
+ o pkg/seaice/seaice_evp.F: add code (copied from CICE) that avoids underflows.
+    Turn on by defining SEAICE_EVP_ELIMINATE_UNDERFLOWS. Most compilers
+    have flags that do this more efficiently.
+ o pkg/diagnostics/diagstats_calc.F
+   - for TARGET_NEC_SX fix the treatment of the scaling factor tmpFac=scaleFact
+ o pkg/obcs (with exch2):
+   - derive OB indices in overlap region from OB-InsideMask (in obcs_init_fixed.F)
+     and remove code (in obcs_readparms.F) which was based on EXCH of indices
+     (through buffer) and did not account for exch2 (e.g., CS-grid) topology.
+ o pkg/exf and seaice exp:
+   - change offline_exf_seaice.seaicetd test exp. to use default DIFF1 value (=0)
+     so that switching off area & heff advection flags does not affect results.
+   - change default EXF_LWDOWN_WITH_EMISSIVITY to #define in EXF_OPTIONS.h
+   - keep exp. seaice_obcs & 1D_ocean_ice_column(ad) unchanged (using #undef
+     EXF_LWDOWN_WITH_EMISSIVITY) and, using pkg/exf default emissivities, update
+     results of verification experiments: 1D_ocean_ice_column(fwd),
+     global_ocean.cs32x15.seaice(fwd+ad) & seaice_dynmix(ad), lab_sea (all 8)
+     and offline_exf_seaice (all 4).
+ o pkg/seaice:
+   - remove array YNEG, RIVER, TMIX (replaced by local var) from common block;
+     remove also areaNm1 & hEffNm1 when SEAICE_GROWTH_LEGACY is undef.
+   - fix bug: areaNm1 & hEffNm1 are needed in seaice_growth (SEAICE_GROWTH_LEGACY)
+     but were not filled when resp. SEAICEadvArea=F & SEAICEadvHeff=F and
+     not multi-dim advection;
+   - fix seaice_growth.F to compile with both SEAICE_GROWTH_LEGACY and
+     SHORTWAVE_HEATING #undef.
+ o optim: make Makefile more robust (?)
+ o pkg/obcs:
+   * fix treatment of obcs_read_pickup for TAF
+ o pkg/shelfice:
+   * add missing initialisation of num_shifwflx
+   * new adjoint verification exp. for isomip
+   * change Prandtl and Schmidt numbers from generic formulations
+     (in terms of model diffus. and visc.) to separate runtime
+     parameters, with Holland and Jenkins (1999) default values.
+ o pkg/exf (interpolation):
+   - extended input field (2 rows) near the N & S poles:
+     * fill in with the symetric value (when even Nb of data in longitude)
+     * add average value at the poles only for scalar quantities ; for vector
+       component interpolation, skip the averaging and keep duplicated values,
+       unless the 2 components have same location (uvInterp=T) in which case
+       interpolate the 2 components together using S/R EXF_INTERP_UV.
+   - new S/R EXF_INTERP_UV to interpolate the 2 components of a vector field
+     together: this allows to account properly for local orientation when
+     averaging at N & S pole.
+   - add CPP option EXF_USE_OLD_INTERP_POLE to recover old results regarding
+     exf-interpolation near N & S poles. Undef by default.
+   - add debug check/print on 1rst iter if debugLevel >=2.
+ o pkg/exf:
+   - change masking flags definition (no longer "parameter"), put them in
+     common block and set them in S/R EXF_INIT_FIXED.
+   - change recognized masking flag from s,u,v to c,w,s since the mask
+     to use (maskC,W,S) depends on position on model grid and has little to
+     do with scalar/vector difference; fix masking if using P-coordinates.
+   - fix masking of wind-stress (was wrong if interpolated or read on A-grid)
+     and update results of exp. global_with_exf (x2).
+   - fix setting of zenith-angle table when SHORTWAVE_HEATING is undef.
+ o pkg/obcs
+   - S/R obcs_calc_stevens: fix a small bug (gammat -> gammas where appropriate)
+ o pkg/exf (interpolation):
+   - assume periodicity in X only if input field cover full longitude range.
+   - improve search for lat. index (supposed to be faster, in ~log2(ny) steps,
+     and should vectorise).
+   - fix input lat of the 2 added row (in case we provide N.pole data).
+ checkpoint63h (2011/12/30)
+ o pkg/seaice:
+   - change declaration of UVM from _RL to _RS in order to get B-grid
+     uIce,vIce monitor when _RS = real*4
+ o pkg/offline:
+   - new S/R OFFLINE_RESET_PARMS for resetting main-model params (switch off flags);
+   - compute vertical velocity if not read from file (switch on exactConserv
+     & staggerTimeStep);
+   - fix output of ptracer monitor iter & time for default PTRACERS_monitorFreq.
+ o verification:
+   - update grid-files (in tutorial_held_suarez_cs/input and fizhi-cs-32x32x40/input)
+     with grid-angle generated using "utils/matlab/cs_grid/cubeCalcAngle.m":
+     fix Pb in yG definition @ 2 missing corners (previously yG was averaged);
+   - update output of exp. global_ocean.cs32x15.viscA4 after changing
+     grid-file angles (used here for coriolis-3d);
+   - remove (or gzip) few files not needed to run fizhi-cs experiments.
+ o pkg/exf (vector interpolation):
+   - rotate vector component toward local grid-axis orientation using grid-angles
+     (stored in GRID.h) instead of locally computed rotation angle; keep old code
+     available with exf option EXF_USE_OLD_VEC_ROTATION (undef by default).
+ o pkg/seaice:
+   - allow to compile with exf options ALLOW_ATM_TEMP or ALLOW_DOWNWARD_RADIATION
+     undefined. Fix and remove the stop when ALLOW_RUNOFF is undefined.
+ o pkg/PKG_OPTIONS.h files:
+   - move #include "CPP_OPTIONS.h" just after #include "PACKAGES_CONFIG.h",
+     outside of the #ifdef ALLOW_THISPKG / #endif block.
+   - update verification/*/code/PKG_OPTIONS.h files.
+ o add a verification experiment (offline_exf_seaice/input.seaice) that test
+   the B-grid LSOR solver
+ o pkg/seaice: sort out emissivity and long wave radiation step 2:
+   - add emissivity for snow and ice as new run-time parameters
+     (unfortunately) that default to the corresponding exf values; this
+     changes results in most verification experiments so that for backward
+     compatibility these parameter have to be set explicitly to inconsistent
+     values (ugly);
+   - the exf-flag EXF_LWDOWN_WITH_EMISSIVITY then gets rid off the hard-wired
+     emissivities of 0.97 associated with lwdownloc in S/R seaice_solve4temp
+     until we agree how to handle this bug properly
+ o pkg/exf (interpolation):
+   - add a set of run-time param ({inputfield}_interpMethod), one for
+     each interpolated input field, to select the interpolation method
+     with a value of zero switching off the interpolation;
+   - print interpolation parameters to standard output;
+   - refine exf_check.F accordingly ; stop if USE_NO_INTERP_RUNOFF is defined
+     (to use instead runoff_interpMethod=0 in data.exf).
+   - simplify default setting of interpolation parameters (for all fields,
+     set position to match model grid cell-center position, leading to trivial
+     interpolation in case of regular Lat-Lon grid) and fix for the case of
+     non-uniform delY.
+ o pkg/exf/exf_radiation.F: add the factor ocean_emissivity to lwdown, for
+    within #ifdef EXF_LWDOWN_WITH_EMISSIVITY/#endif. Unless ocean_emissivity=1.
+    this factor is absolutely required, because the lw exitance (= out-going
+    long wave radiation) is emissivity*stefanBoltzmann*T^4 + rho*lwdown,
+    where the reflectivity rho = 1-emissivity for conservation reasons. Once
+    this is established, we can remove the CPP-Flag (if we want to).
+ o pkg/seaice:
+   - qualify a stop statement in S/R seaice_check: EXF_READ_EVAP and
+     ALLOW_BULKFORMULAE are only required if SEAICE_EXTERNAL_FLUXES is defined
+   - sort out emissivity and long wave radiation, step 1: make SEAICE_emissivity
+     what the name implies (and not emissivity*BoltzmannConstant), this means
+     the old default value of 5.5e-8 now means
+.5e-8/5.670e-8 = 0.97001763668430343479 as ocean_emissivity in
+     S/R exf_readparms
+   - FV-discretization of the B-grid LSOR solver, turn on with
+     SEAICE_LSRBNEW. This new solver also involves a slight re-organization
+     of the calling routine dynsolver, so that B and C-grid code look a
+     little more alike.
+   - fix index bugs in ostres.F (B-grid code)
+ o pkg/seaice/seaice_ocean_budget.F: change (unused) code to make it look better
+ o pkg/seaice/seaice_readparms.F: make ocean_emissivity*stefanBoltzmann the
+   default for SEAICE_emissivity, if useEXF; requires setting a wrong
+   parameter value in global_ocean.cs32x15/input.seaice/data.seaice for
+   backward compatiblity
+ o model/src: use sigmaR in calc_ivdc
+ checkpoint63g (2011/12/16)
+ o pkg/seaice/seaice_growth.F:
+   fix heat conservation of the coupled ocean-seaice system.
+   when SEAICE_HEAT_CONSERV_FIX is defined, the mismatch of
+   solid vs liquid water treatment is resolved via QNET.
+ o pkg/seaice/seaice_growth.F:
+   add missing term for sublimation in saltFlux, which was breaking conservation.
+ o pkg/seaice/seaice_model.F:
+   Remove this patholigical case treatment in evolution branch,
+   where it is un-necessary and breaks conservation.
+   Update global_ocean.cs32x15/results accordingly for
+   output.seaice.txt output_adm.seaice.txt and output_adm.seaice_dynmix.txt
+ o model/src:
+   useRealFreshWaterFlux: remove masking of EmPmP (using maskInC) in
+   external_forcing_surf.F and apply mask directly in S/R SOLVE_FOR_PRESSURE.
+ o pkg/obcs:
+   modify Stevens boundary conditions so that S/R obcs_calc_stevens computes
+   tendency for temperature and salinity that is then applied to update
+   theta and salt in S/R obcs_apply_ts; this requires proper masking of all
+   horizontal advection and diffusion contributions on the boundary (in
+   S/Rs gad_advection, gad_calc_rhs, gmredi_rtransport, gmredi_calc_diff), and
+   removing the mask in S/R timestep_tracer. The advantage of this approach is
+   that the updated tracer values include contributions from the surface
+   forcing and vertical diffusion.
+   This modification changes exp4.stevens because of vertical diffusion.
+ o model/src:
+   change non-curvilinear grid setting to also work with exch2 + blank tiles:
+   - move delX,delY to new header file (SET_GRID.h) and adjust length to 1rst
+     face dimensions.
+   - new S/R INI_LOCAL_GRID to define model tile-local grid (using same units
+     as delX,delY) and called from S/R INI_CARTESIAN_GRID, INI_CYLINDER_GRID
+     and INI_SPHERICAL_POLAR_GRID.
+   change test-experiment global_ocean.90x40x15:
+   - split the domain in many more tiles (9x4 tiles of 10x10 each);
+   - switch to exch2 and remove 1 blank-tile (but only for MPI test).
+   - update results of both test (std & dwnslp).
+ o pkg/diagnostics/diagstat_calc.F: fix problem with non-initialised halos in
+    tmp-fields for TARGET_NEC_SX at the cost of extra loops and less vectorisation
+ o model/src:
+   - take sigma-coords related code out of update_etah.F into new S/R UPDATE_ETAWS
+     and fix initialisation when using sigma-coords.
+ o model/src:
+  - improve Gael's changes from Jan 14, 2011 "addition of an 'update' of hfacc etc.
+    to their current value at the beginning of forward_step.F": add a new run-time
+    switch "doResetHFactors" (default=false) and use it to do (or not) the resetting.
+  - set doResetHFactors=T in the following test exp:
+     global_ocean.90x40x15/input (rStar) & input.dwnslp (linFS),
+     global_ocean.cs32x15/input.seaice (rStar), hs94.cs-32x32x5/input.impIGW (linFS)
+     and tutorial_global_oce_in_p (nonLinFS in p)
+ o pkg/ecco
+   - added IES cost term
+ o verification/advect_xz
+   - scale down the depth by 1/100 (from 200 km to just 2.km)
+   - add secondary test using divergent flow, r-star and implicit vertical advection.
+   - add note (check_conserve_TS.txt) and matlab script to check global
+     conservation of T & S with NonLin-FreeSurf and Adams-Bashforth.
+ o pkg/rbcs:
+   - add missing relaxUFile & relaxVFile in namelist (in rbcs_readparms.F).
+ o pkg/obcs (Stevens BCs):
+   - fix various problems in the phase speed computations of the Stevens
+     boundary conditions:
+     - sign error for western and southern boundaries,
+     - time tendencies were underestimated by factor of dTracerLev and some just
+       zero (for multidim advection schemes) -> now estimate time tendencies
+       from difference between previous (n) time level and the one before (n-1);
+       this requires storing a field per tracer per boundary, also in the pickup
+       files.
+     - replace deltaTmom in cflMer/Zon computation with dTracerLev
+     - set default phase velocity to cflMer/Zon
+   - update verification experiment exp4.stevens
+ o pkg/generic_advdiff (implicit_r):
+   - fix implicit vertical advection conservation with AB and/or NonLin-FreeSurf
+     (remove Tr*d/dz(w) in gad_implicit_r.F and add it in gad_calc_rhs.F);
+   - fix implicit vertical diffusion or advection with NonLin FreeSurf
+     (was using current recip_hFacC instead of future recip_hFacC): set future
+     recip_hFac in thermodynamics.F and pass & use it in all vertical implicit
+     solver S/R ;
+   - fill diagnostics of vertical advective fluxes (computed from tendency)
+     when using implicit vert. advection;
+   - update output of exp that uses NonLin-FreeSurf & implicit vertical diffusion:
+      global_ocean.90x40x15 (fwd+AD), global_ocean.cs32x15 (4 fwd +4 AD),
+      tutorial_global_oce_in_p (fwd), tutorial_tracer_adjsens (AD)
+      and cpl_aim+ocn (used in ocean); to be fixed: bottom_ctrl_5x5.
+ o pkg/diagnostics:
+   - add diags for T & S tendency which goes through Adams-Bashforth.
+ checkpoint63f (2011/11/30)
+ o pkg/obcs/obcs_calc_stevens.F:
+   - join some loops to reduce number of if-statements
+   - fix a bug in code for northern and southern boundaries.
+ o pkg/seaice/seaice_init_varia.F
+   - undo resetting UVM=0 that has slipped in unnoticed in r1.49 and
+     caused zero ice-velocities for the B-grid code
+ o pkg/seaice/seaice_init_fixed.F
+   - fix a bug in the initialisation of the second metric terms
+     k2AtC and k2AtZ: k2AtC was set to the value of k2AtZ and k2AtZ was 0.
+   - this affects all seaice configurations with useCurviLinearGrid = .true.
+     and SEAICEuseDynamics = .true. (default) and SEAICEuseMetricTerms
+     = .true. (default)
+   - the only verification experiment affected is global_ocean.cs32x15:
+     icedyn, seaice, and seaice_dynmix (AD)
+ o pkg/thsice/thsice_diagnostics_state.F
+   - only for TARGET_NEC_SX: initialise all of tmpFld, so that overlap does
+     not contain garbage that can lead to surprises in diagstats_calc.F
+ o model/src:
+   - move bi,bj loops inside INTEGR_CONTINUITY ;
+   - call INTEGR_CONTINUITY directly from forward_step.F
+     (previously called from momentum_correction_step.F)
+   - call UPDATE_ETAH from integr_continuity.F and update initialise_varia.F,
+     forward_step.F and pkg/ecco/the_main_loop.F
+ o model/src/do_oceanic_phys.F:
+   - reset addMass to zero only if useICEFRONT ;
+   - separated k-loop for rhoInSitu calculation ;
+   - add 2 diagnostics for wVel*delta^k(Rho) at constant pressure (= WdRHO_P)
+     and at constant T,S (= WdRHOdP);
+   NOTE: change diagnostics WRHOMASS : this is now simply the Vertical transport
+     of In-Situ Density (Anomaly) (=wVel*rho^bar-k) (previously was Vertical
+     transport of locally-referenced potential density);
+     to recover old diag: (WRHOMASS)_old = (WRHOMASS)_new -1/2 * (WdRHOdP)
+ o gluemnc:
+   - replace ncrcat with ncks when adding variables to *.glob.nc
+   - change the way variables without record dimensions are handled so that
+     files that have variables with and without record variables can be glued:
+     add a record dimension with a new unique name to be able to differentiate
+     between variable with and without a-prior record dimensions. Remove
+     this record dimension before adding the variable to the *.glob.nc file.
+     This procedure automatically works also for grid.*.nc files that do not
+     have any record dimension.
+ o verification/cpl_aim+ocn:
+   - generate new reference output on baudelaire (gfortran, mpich2) (previously
+     from old aces-grid cluster, ao + ifort) and update 'run_cpl_test' script.
+ o pkg/obcs/obcs_calc_stevens.F:
+   - add code for northern and southern boundaries.
+   - reorder some loops to save some operations and so that drFBar can be scalar
+ o model/src:
+   - re-arrange extrapolation calculation in Adams-Bashforth S/R (affects machine
+     truncation) and add diagnostics for Adams-Bashforth tendency increment.
+   - update test-exp. AD output:
+D_ocean_ice_column, bottom_ctrl_5x5, lab_sea.noseaicedyn, obcs_ctrl;
+   and FWD output: exp4 (x3), fizhi-cs-32x32x40, fizhi-cs-aqualev20,
+     front_relax (x3), global_ocean.90x40x15 (x2), global_ocean.cs32x15 (x5),
+     global_ocean_ebm, ideal_2D_oce, internal_wave, isomip (x3), lab_sea (x4),
+     matrix_example, MLAdjust (x5), natl_box (x2), tutorial_advection_in_gyre,
+     tutorial_global_oce_in_p, tutorial_global_oce_latlon and
+     tutorial_plume_on_slope.
+ o pkg/diagnostics/diagstats_calc.F: add special code for TARGET_NEC_SX
+   that vectorises. This code uses 3 extra 2D fields, F90 array assignments
+   and F90 intrinsic routines SUM, MINVAL, MAXVAL, but since TARGET_NEC_SX
+   does not even come with an F77 compiler anymore, this should not be
+   a limitation
+ checkpoint63e (2011/11/06)
+ o pkg/seaice adjoint of LSR:
+   - substantially rework STORE dirs.
+   - add new flag SEAICE_LSR_ADJOINT_ITER and parameter SOLV_MAX_FIXED
+     this flag will do SOLV_MAX_ITERS but only store SOLV_MAX_FIXED fields
+     and only perform SOLV_MAX_FIXED adjoint iters.
+     If flag SEAICE_LSR_ADJOINT_ITER is undef-ined, the store in the iteration
+     always goes to same record, meaning that the last forward field will be
+     the one used in the adjoint - an approximation.
+   - now produces non-zero LSR-related gradients, and acceptable gradients for
+     An's zonal (x-z) test case (to be checked in)
+   - lab_sea: produces acceptable gradients for lab_sea with forward/backward LSR
+     (but these are screwed up by the thermodynamics in the first place);
+     reduce from 4 to 3 timesteps to avoid t.d. issue as temporary solution;
+     output_adm.txt also reflects changes to seaice_lsr
+   - global_ocean.cs32x15:
+     * the "default" input_ad.seaice has been re-defined to always exclude dynamics
+       (output_adm.seaice.txt was updated)
+     * new input_ad.seaice_dynmix tests a forward LSR / backward free-drift
+       (output_adm.seaice_dynmix.txt)
+ o test-exp. exp4+stevens:
+   - switch off pTracers and nonHydrostatic (restart problems with NH); update output
+ o pkg/seaice (lsr solver):
+   - put coriolis term into FORCEX,Y (as in seaice_evp.F; previously in rhsU,V only);
+     update output (change truncation) of FWD test exp lab_sea & global_ocean.cs32x15
+   - fix SEAICEuseFREEDRIFT for new OBCS version (ndef OBCS_UVICE_OLD)
+   - new parameter "LSR_mixIniGuess" allows (if=2,4) to mix free-drift solution
+     into initial guess for linearised solver; use weight ~ (1/err)^2,4.
+   - compute (with new S/R) and print initial (+ free-driff sol. if available)
+     and final residual of linearised system.
  o pkg/pp81: add diagnostics for vertical eddy viscosity and diffusivity
    (requires new subroutines pp81_init_fixed.F/pp81_diagnostics_init.F)
  o pkg/obcs: Stevens BCs (still only for east and west)
    - fix Stevens BCs by using intermediate velocities of previous
      time step as "baroclinic" contribution rather velocity of one grid cell
      inside the boundaries; more consistent but makes the entire treatment
      more complicated, requires new pickup files and two new S/Rs:
      obcs_copy_uv_n and obcs_save_uv_n
      keep old version with flag OBCS_STEVENS_USE_INTERIOR_VELOCITY
      (undefined by default)
    - silently move computation of some grid factors into separate loops to
      save some recomputations
    - add a hack for non-linear free surface
    - add a verification experiment to exp4 that tests this code

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