Commented out calls for Shapiro and zonal filters. JMC had moved these from the_main_loop.F to the_correction_step.F but had disabled them in the_main_loop.F by overriding CPP options. When PH re-instated forward_step.F the options weren't overridden. Commenting out seems safer.
Commented out calls for Shapiro and zonal filters. JMC had moved
these from the_main_loop.F to the_correction_step.F but had disabled
them in the_main_loop.F by overriding CPP options. When PH re-instated
forward_step.F the options weren't overridden. Commenting out seems
safer.

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