useSingleCpuIO: done whatever ALLOW_USE_MPI is (like in mdsio_readfield.F)
useSingleCpuIO: done whatever ALLOW_USE_MPI is (like in mdsio_readfield.F)

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