directory rpncomm:
  RPN_COMM communication library for 2D grid based models
directory tools:
  fstouv_byname.... open a group of "RPN standard files" as on file
directory mpi-serial:
  MPI serial library extracted from the Modeling Coupling Toolkit (MCT) Software
  Copyright © 2011, UChicago Argonne, LLC as Operator of Argonne National Laboratory.
  All rights reserved.
  (For use with RPN_COMM communication library)
  (A few routines have been/will be added)