- some fixes in pkg/flt with exch2 ; finish to remove ALWAYS_USE_MPI   which is no longer set in Makefile (was done by genmake2).
- some fixes in pkg/flt with exch2 ; finish to remove ALWAYS_USE_MPI
  which is no longer set in Makefile (was done by genmake2).

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