message: Use helper::Comm() instead of MPI_COMM_SELF for a simple communicator
diff: @@ -119,8 +119,7 @@ bool IsHDF5File(const std::string &name, helper::Comm &comm,
  {
  try
  {
  - transportman::TransportMan tm(Comm::Duplicate(MPI_COMM_SELF),
  - false);
  + transportman::TransportMan tm(Comm(), false);
  if (transportsParameters.empty())
  {
  std::vector<Params> defaultTransportParameters(1);
  