- always set horiz. viscosity arrays to background value before calling   MOM_CALC_VISC (in MOM_FLUXFORM & MOM_VECINV) and call S/R MOM_CALC_VISC   only when using variable horiz. viscosity (useVariableVisc=T);
- always set horiz. viscosity arrays to background value before calling
  MOM_CALC_VISC (in MOM_FLUXFORM & MOM_VECINV) and call S/R MOM_CALC_VISC
  only when using variable horiz. viscosity (useVariableVisc=T);

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