change Nr to mynr to fix loop range in S/R ACTIVE_WRITE_XZ_RL,   REVERSE_SIMULATION part.
change Nr to mynr to fix loop range in S/R ACTIVE_WRITE_XZ_RL,
  REVERSE_SIMULATION part.

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