change to be truly a 2-D set-up (previously Nx was 2); also change  to 2 tiles with Olx=Oly=2 (same as fwd set-up).
change to be truly a 2-D set-up (previously Nx was 2); also change
 to 2 tiles with Olx=Oly=2 (same as fwd set-up).

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