remove seaice age code corresponding to the case where thsice is used: 1) ice-age not available with thsice and 2) if it was, would be part of thsice.
remove seaice age code corresponding to the case where thsice is used:
1) ice-age not available with thsice and 2) if it was, would be part of thsice.

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