message: Documenting the enumeration used in ElementTransformation
diff: @@ -49,7 +49,20 @@ protected:
  const DenseMatrix &EvalInverseJ();
  public:
  - enum IndexType
  +
  + /** This enumeration declares the values stored in
  + ElementTransformation::ElementType and indicates which group of
  + objects the index stored in ElementTransformation::ElementNo
  + refers:
  +
  + | ElementType | Range of ElementNo
  + +-------------+-------------------------
  + | ELEMENT | [0, Mesh::GetNE() )
  + | BDR_ELEMENT | [0, Mesh::GetNBE() )
  + | EDGE | [0, Mesh::GetNEdges() )
  + | FACE | [0, Mesh::GetNFaces() )
  + */
  + enum
  {
  ELEMENT = 1,
  BDR_ELEMENT = 2,
  