add capability to bypass interpolation for runoff by setting yet another CPP-flag; this new file is an exact copy of exf_set_gen.F except for the name of the subroutine and the interpolation option.
add capability to bypass interpolation for runoff by setting yet
another CPP-flag; this new file is an exact copy of exf_set_gen.F
except for the name of the subroutine and the interpolation option.

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