MPH_local_world - find local communicator of an executable

This function returns the local MPI communicator of an executable given the executable id.

REVISION HISTORY:

       2001-Dec-13 -- change function name from MPH_local_world to MPH_exe_world,
                      use optional argument
       2001-Nov-15 -- add PROTEX convention
       2001-May-20 -- first prototype

INTERFACE:

       integer function MPH_exe_world (eid)

USES:

       implicit none

INPUT PARAMETERS:

       integer, intent(in), optional :: eid   ! executable id

OUTPUT PARAMETERS:

       ! exe_world (eid)

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