- change default (non-MPI) value of myPid (from 1 to 0) to match MPI settings   (so that on 1 proc, get same myPid independently of usingMPI) - add a stop if multi-procs but usingMPI=F ; start to remove ALWAYS_USE_MPI
- change default (non-MPI) value of myPid (from 1 to 0) to match MPI settings
  (so that on 1 proc, get same myPid independently of usingMPI)
- add a stop if multi-procs but usingMPI=F ; start to remove ALWAYS_USE_MPI

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