- add parenthesis in Water-Ice drag calculations; - simplify and fix AA3 setting in case sNx or sNy=1; - fix case SEAICE_waterDrag=0 (but unstable if no or little seaice)
- add parenthesis in Water-Ice drag calculations;
- simplify and fix AA3 setting in case sNx or sNy=1;
- fix case SEAICE_waterDrag=0 (but unstable if no or little seaice)

altMITgcm/MITgcm66h,altMITgcm/MITgcm66h,altMITgcm/MITgcm66h,altMITgcm/MITgcm66h,altMITgcm/MITgcm66h,altMITgcm/MITgcm66h,altMITgcm/MITgcm66h,altMITgcm/MITgcm66h