/*D
   MPI_Info_set - Adds a (key,value) pair to info

Synopsis:
.vb
int MPI_Info_set(MPI_Info info, const char *key, const char *value)
.ve

Input Parameters:
+ info - info object (handle)
. key - key (string)
- value - value (string)

.N NotThreadSafe

.N Fortran

.N Errors
.N MPI_SUCCESS
.N MPI_ERR_ARG
.N MPI_ERR_INFO
.N MPI_ERR_OTHER

D*/

