message: Added a check before MPI_Waitany in communication.cpp - some MPI versions
  segfault without it.
diff: @@ -238,6 +238,8 @@ void GroupTopology::Create(ListOfIntegerSets &groups, int mpitag)
  mpitag, MyComm, &recv_requests[nbr-1]);
  }
  }
  +
  + if (recv_requests.Size() > 0)
  {
  int idx;
  IntegerSet group;
  