/*D
   MPI_Group_size - Returns the size of a group

Synopsis:
.vb
int MPI_Group_size(MPI_Group group, int *size)
.ve

Input Parameters:
. group - group (handle)

Output Parameters:
. size - number of processes in the group (integer)

.N ThreadSafe

.N Fortran

.N Errors
.N MPI_SUCCESS
.N MPI_ERR_ARG
.N MPI_ERR_GROUP
.N MPI_ERR_OTHER

D*/

