message: Better error message for Mesh::MakeSimplicial with nonconforming mesh
diff: @@ -3972,6 +3972,8 @@ void Mesh::MakeSimplicial_(const Mesh &orig_mesh, int *vglobal)
  {
  MFEM_VERIFY(const_cast<Mesh&>(orig_mesh).CheckElementOrientation(false) == 0,
  "Mesh::MakeSimplicial requires a properly oriented input mesh");
  + MFEM_VERIFY(orig_mesh.ncmesh == NULL,
  + "Mesh::MakeSimplicial does not support non-conforming meshes.")
  int dim = orig_mesh.Dimension();
  int sdim = orig_mesh.SpaceDimension();
  