message: Add MPI_Comm_free to properly free communicators
diff: @@ -806,6 +806,8 @@ TEST(spio_parallel, parallel_increase_procs)
  delete ds2;
  delete ds;
  + MPI_Comm_free(&split_comm);
  +
  #endif
  }
  @@ -945,6 +947,8 @@ TEST(spio_parallel, parallel_decrease_procs)
  delete ds2;
  delete ds;
  + MPI_Comm_free(&split_comm);
  +
  #endif
  }
  