Simple set-up to test flow-dependent horizontal viscosity implementation.

 Domain size is 50 x 26 x 40 grid-cells, 
 with uniform resolution dx=dy= 1.km , dz = 5.m
 
 Zonally re-entrant, flat bottom channel (closed by Northern Wall @ j=26)

 input files are real*8 (see matlab script input/genit.m )

 start from initial density field (given by initial Temp), no forcing

 Test Exp. |  Momentum   | useFullLeith | Strain-Tension | Biharmonic | side-drag   |
           | formulation |              |  formulation   | vs harmonic| (no_slip BC)|
-------------------------------------------------------------------------------------
 standard  | Vector-Inv. | FullLeith    |       No       |   viscC4   |    No       |
(dir=input)|             |              |                |            |             |
-------------------------------------------------------------------------------------
 .0.smag   | Vector-Inv. | FullLeith    |       No       |   viscC2   |    No       |
-------------------------------------------------------------------------------------
 .0.leith  | Vector-Inv. | FullLeith    |       Yes      |   viscC2   |    No       |
-------------------------------------------------------------------------------------
 .0.leithD | Vector-Inv. |    No        |       No       |   viscC2   |    No       |
-------------------------------------------------------------------------------------
 .1.leith  | Vector-Inv. | FullLeith    |       No       |   viscC4   |    No       |
-------------------------------------------------------------------------------------
 
Notes: 
1) Stain-Tension viscosity formulation is used when setting 
     useStrainTensionVisc=.TRUE.,
   default is .False., to use vorticity & divergence formulation
2) test 1.leith (input.1.leith) starts from a pickup-file, 
   all other test exp. start from iter0=0
3) test with Biharmonic visc. are using:
    viscC4leith = viscC4leithD = 1.85, 
    viscC4smag  = 1.,
    viscA4GridMax = 1.,
4) test with Harmonic visc. are using:
    viscC2leith = viscC2leithD=1.85, 
    viscC2smag  = 1.,
    viscAhGridMax = 1.,

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