message: don't throw exception if we detect no threaded MPI, we support it now
diff: @@ -153,12 +153,9 @@ namespace mpicommon {
  case MPI_THREAD_MULTIPLE:
  mpiIsThreaded = true;
  break;
  - case MPI_THREAD_SERIALIZED:
  + default:
  mpiIsThreaded = false;
  break;
  - default:
  - throw std::runtime_error("fatal MPI error: MPI runtime doesn't offer "
  - "even MPI_THREAD_SERIALIZED ...");
  }
  world.comm = MPI_COMM_WORLD;
  