move call to AIM_FIELDS_LOAD from EXTERNAL_FIELDS_LOAD to LOAD_FIELDS_DRIVER
move call to AIM_FIELDS_LOAD from EXTERNAL_FIELDS_LOAD to LOAD_FIELDS_DRIVER

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