Fixes trac:389

Make the Fortran MPI_MAX_DATAREP_STRING follow the same convention as
the rest of the Fortran constants -- be one less than the C constant
of the same name.

This commit was SVN r11842.

The following Trac tickets were found above:
  Ticket 389 --> https://svn.open-mpi.org/trac/ompi/ticket/389

ompi/include/mpif-common.h

@@ -114,7 +114,7 @@
       parameter (MPI_ROOT=-4)
       parameter (MPI_MAX_PROCESSOR_NAME=255)
       parameter (MPI_MAX_ERROR_STRING=255)
-      parameter (MPI_MAX_DATAREP_STRING=128)
+      parameter (MPI_MAX_DATAREP_STRING=127)
       parameter (MPI_UNDEFINED=-32766)
       parameter (MPI_CART=1)
       parameter (MPI_GRAPH=2)