message: Documenting the new function.
diff: @@ -674,6 +674,11 @@ public:
  DenseMatrix &I,
  const ScalarFiniteElement &fine_fe) const;
  + /** @brief Get restriction matrix @a R defined through local L2-projection
  + in the space defined by the @a coarse_fe. */
  + /** If the "fine" elements cannot represent all basis functions of the
  + "coarse" element, then boundary values from different sub-elements are
  + generally different. */
  void ScalarLocalRestriction(ElementTransformation &Trans,
  DenseMatrix &R,
  const ScalarFiniteElement &coarse_fe) const;
  