message: Simplified group_map in ParNCMesh::GetConformingSharedStructures.
diff: @@ -791,8 +791,9 @@ void ParNCMesh::GetConformingSharedStructures(ParMesh &pmesh)
  }
  // create ParMesh groups, and the map (ncmesh_group -> pmesh_group)
  - std::map<int, int> group_map;
  + Array<int> group_map(groups.size());
  {
  + group_map = 0;
  IntegerSet iset;
  ListOfIntegerSets int_groups;
  for (unsigned i = 0; i < groups.size(); i++)
  @@ -816,7 +817,7 @@ void ParNCMesh::GetConformingSharedStructures(ParMesh &pmesh)
  }
  }
  - // create shared to local index mappings
  + // create shared to local index mappings and group tables
  int ng = pmesh.gtopo.NGroups();
  MakeSharedTable(ng, entity_conf_group[0], pmesh.svert_lvert, pmesh.group_svert);
  MakeSharedTable(ng, entity_conf_group[1], pmesh.sedge_ledge, pmesh.group_sedge);
  