message: After testing, turned on the temporary suboptimal version of ParNCMesh::AddMasterSlaveConnections.
diff: @@ -433,7 +433,7 @@ struct MasterSlaveInfo
  void ParNCMesh::AddMasterSlaveConnections(int nitems, const NCList& list)
  {
  -#if 1
  +#if 0 // optimal version for P matrix construction but breaks ParMesh::Print and DG
  Array<int> masters(nitems);
  masters = -1;
  @@ -462,7 +462,8 @@ void ParNCMesh::AddMasterSlaveConnections(int nitems, const NCList& list)
  index_rank.Append(Connection(master, rank));
  }
  }
  -#else
  +#else // suboptimal version fully linking master and slave entities in groups
  +
  // create an auxiliary structure for each edge/face
  std::vector<MasterSlaveInfo> info(nitems);
  