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Routine psmile_def_mpi_comm (ierror)
Subroutine PSMILe_Def_MPI_Comm defines the communicators if all processes were simultaneously started by the mpirun/mpiexec command.

The routine assumes that communicator "comm_global" is defined.

It constructs           the  communicator for the application "Appl%comm",
                               the user communicator of the application "Appl%comm_user" and
                               the communicator with the coupler "comm_coupler".
                               the communicator for the PSMILe library "comm_psmile"
as the drievr is calling on its side prismdrv_def_mpi_comm.