- use reference profile for w <-> omega conversion in NH-code - change grid factor arround a W-point to work in p-coord. (keep   the previous version within #ifndef CALC_GW_NEW_THICK for now)
- use reference profile for w <-> omega conversion in NH-code
- change grid factor arround a W-point to work in p-coord. (keep
  the previous version within #ifndef CALC_GW_NEW_THICK for now)

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