message: changing MPI_Session to Mpi::Init
diff: @@ -57,9 +57,10 @@ using namespace mfem;
  int main(int argc, char *argv[])
  {
  // 0. Initialize MPI.
  - MPI_Session mpi;
  - int num_procs = mpi.WorldSize();
  - int myid = mpi.WorldRank();
  + Mpi::Init(argc, argv);
  + int num_procs = Mpi::WorldSize();
  + int myid = Mpi::WorldRank();
  + Hypre::Init();
  // 1. Parse command-line options.
  const char *mesh_file = "../data/star.mesh";
  