message: Add NonlinearFormIntegrator::GetIntegrationRule
diff: @@ -43,6 +43,9 @@ public:
  /// Prescribe a fixed IntegrationRule to use.
  void SetIntegrationRule(const IntegrationRule &irule) { IntRule = &irule; }
  + /// Get the integration rule of the integrator (possibly NULL)
  + const IntegrationRule *GetIntegrationRule() const { return IntRule; }
  +
  /// Perform the local action of the NonlinearFormIntegrator
  virtual void AssembleElementVector(const FiniteElement &el,
  ElementTransformation &Tr,
  