pkg/exf: fix masking of wind-stress (was wrong if interpolated or read  on A-grid) and update results of exp. global_with_exf (x2).
pkg/exf: fix masking of wind-stress (was wrong if interpolated or read
 on A-grid) and update results of exp. global_with_exf (x2).

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