message: Update const-ness to match the new const result of the method
  GroupCommunicator::GetGroupTopology().
diff: @@ -745,7 +745,7 @@ ParAlgebraicCoarseSpace::ParAlgebraicCoarseSpace(
  ldof_group.SetSize(lsize);
  ldof_group = 0;
  - GroupTopology &group_topo = gc_fine->GetGroupTopology();
  + const GroupTopology &group_topo = gc_fine->GetGroupTopology();
  gc = new GroupCommunicator(group_topo);
  Table &group_ldof = gc->GroupLDofTable();
  group_ldof.MakeI(group_ldof_fine.Size());
  