message: Make dgtrace more self-documented.
diff: @@ -192,8 +192,10 @@ void DGTraceIntegrator::SetupPA(const FiniteElementSpace &fes, FaceType type)
  }
  else if ( face.IsOfFaceType(type) )
  {
  + const int mask = FaceElementTransformations::HAVE_ELEM1 |
  + FaceElementTransformations::HAVE_LOC1;
  FaceElementTransformations &T =
  - *fes.GetMesh()->GetFaceElementTransformations(f,5); // Elem1 and Loc1
  + *fes.GetMesh()->GetFaceElementTransformations(f, mask);
  for (int q = 0; q < nq; ++q)
  {
  // Convert to lexicographic ordering
  