===================================================================
dir Tree of PRM set-up: 
------------------------
in dir: verification/prm/multi_comp_setup/
 comp_mitgcm/
 cg/
 fg/
 esmf_test/
 doc/		<- not used
 multi_code/	<- not used
----------------
in dir: comp_mitgcm/
	build/		<- scripts
	code_basic/	<- basic src (eeboot + driver + main)
	code_fancy/	<- not used
in dir: cg/
	build/		<- used to build mitgcm cg lib
	code/		<- cg src files
in dir: fg/
	build/		<- used to build mitgcm fg lib
	code/		<- fg src files
----------------------------------------------------
in dir: verification/prm/multi_comp_setup/esmf_test:
	build/
	code_base/
	run/
 ----------------
 in dir: esmf_test/build/
 		a.out.cg/
 		a.out.fg/
 		common/
    dir: esmf_test/build/a.out.cg/
	 		build/
 			pkg/
 			src/
    dir: esmf_test/build/a.out.fg/
 			build/
 			pkg/
 			src/
 ----------------
 in dir: esmf_test/code_base/
 		pkg/
 		src/
    dir: esmf_test/code_base/pkg/
 			cg/
 			cg2fg/
 			cg_stub/
 			computeCG/
 			computeFG/
 			fg/
 			fg2cg/
 			fg_stub/
 			mitgcm_state/
			myesmf_redist/
 ----------------
 in dir: esmf_test/run/
 		inputs/
 		rundir/
 		test_redist/	<- not used
    dir: esmf_test/run/inputs/
 			cg/
 			fg/
    dir: esmf_test/run/rundir/
 			cg/
 			fg_000001/
 			fg_000002/
 			fg_000003/
 			fg_000004/
 			mscripts/
     in: esmf_test/run/rundir/fg_000001/
 				00000100/
     in: esmf_test/run/rundir/fg_000002/
 				00000100/
     in: esmf_test/run/rundir/fg_000003/
 				00000100/
     in: esmf_test/run/rundir/fg_000004/
 				00000100/
===================================================================
Code structure:
-----------------
in dir: multi_comp_setup/comp_mitgcm/code_basic/
  driver_init.F       -> CALL EEBOOT
                      -> CALL INITIALISE_FIXED
  driver_init_varia.F -> CALL INITIALISE_VARIA
  driver_run.F        -> CALL FORWARD_STEP
 + eeboot.F , eeboot_minimal.F , field_getset.F , 
 + set_dir.c , get_dir.c , setdir.c
in dir: multi_comp_setup/cg/code/
  calc_export_2fg.F
  set_ddtvars.F
in dir: multi_comp_setup/cg/code/
  apply_cg_import.F
  calc_export_2cg.F
  calc_fg_forcing.F
  mitgcm_ecomp_irf.F
 + local version: mom_fluxform.F , mypackage_tendency_apply.F , write_state.F


in dir: multi_comp_setup/esmf_test/code_base/src/
src/main.F90 contains:
     PROGRAM TOP
 (read file "data.shared")

in dir: multi_comp_setup/esmf_test/code_base/pkg/

cg_stub/cg_mod.F90 contains:
 S/R cgSetServices
 S/R MYINIT       -> STOP 'CG_STUB MYINIT'
 S/R MYRUN        -> STOP 'CG_STUB MYRUN'

cg/cg_mod.F90 contains:
 S/R cgSetServices
 S/R MYINIT       -> CALL COMPUTE_INIT
 S/R MYRUN        -> CALL COMPUTE_RUN

computeCG/computecg.F90 contains:
 S/R COMPUTE_INIT -> CALL DRIVER_INIT
 S/R COMPUTE_RUN  
     if iLoop=0:  -> CALL DRIVER_INIT_VARIA
     if iLoop>0:  -> CALL SET_DDTVARS      
     if iLoop>0:  -> CALL DRIVER_RUN 
                  -> CALL CALC_EXPORT_2FG
                  -> CALL GET_DYNVARS

cg2fg/cg2fg_mod.F90 contains:
 S/R cg2fgSetServices
 S/R DO_COUPLING
 S/R DO_COUPLING_SETUP
 S/R MYINIT       -> CALL DO_COUPLING_SETUP
 S/R MYRUN        -> CALL DO_COUPLING

fg_stub/fg_mod.F90 contains:
 S/R fgSetServices
 S/R MYINIT       -> STOP 'FG_STUB MYINIT'
 S/R MYRUN        -> STOP 'FG_STUB MYRUN'

fg/fg_mod.F90 contains:
 S/R fgSetServices
 S/R MYINIT       -> CALL COMPUTE_INIT
 S/R MYRUN        -> CALL COMPUTE_RUN

computeFG/computefg.F90 contains:
 S/R COMPUTE_INIT -> CALL DRIVER_INIT
                     CALL GET_DYNVARS (x nFgM)
 S/R COMPUTE_RUN  
     if iLoop=0:  -> CALL DRIVER_INIT_VARIA (x nFgM)
     if iLoop>0:  -> CALL SET_DYNVARS       (x nFgM)
               \  -> CALL APPLY_CG_IMPORT   (x nFgM)
                \ -> CALL CALC_FG_FORCING   (x nFgM)
                 \-> CALL DRIVER_RUN        (x nFgM)
                  -> CALL CALC_EXPORT_2CG   (x nFgM)
                  -> CALL GET_DYNVARS       (x nFgM)

fg2cg/fg2cg_mod.F90 contains:
 S/R fg2cgSetServices
 S/R DO_COUPLING  -> CALL MYESMF_FieldRedist
 S/R DO_COUPLING_SETUP
 S/R MYINIT       -> CALL DO_COUPLING_SETUP
 S/R MYRUN        -> CALL DO_COUPLING
----------------------------------------------------
===================================================================