o pkg/obcs/exf: add useOBCSYearlyFields (=.FALSE.) to obcs with exf in   analogy to useExfYearlyFields
o pkg/obcs/exf: add useOBCSYearlyFields (=.FALSE.) to obcs with exf in
  analogy to useExfYearlyFields

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