make allowsRefinement filer time-dependent

dune/fem-dg/models/defaultmodel.hh

@@ -275,9 +275,11 @@ public:
   /** \brief check with the problem setup whether or not a cell is allowed to be refined
    *
    *  \param[in] en Entity
+   *  \param[in] time Current model time
    *  \return true if the cell can be refined
    */
-  inline bool allowsRefinement( const EntityType& en ) const
+  inline bool allowsRefinement( const EntityType& en,
+                                const double time ) const
   {
     return true;
   }

dune/fem-dg/operator/dg/discretemodelcommon.hh

@@ -569,7 +569,7 @@ namespace Dune {
                          JacobianRangeType& gDiffLeft,
                          JacobianRangeType& gDiffRight ) const
     {
-      if( ! model_.allowsRefinement( inside() ) )
+      if( ! model_.allowsRefinement( inside(), time ) )
         return 0.;
 
       double ldt = BaseType :: numericalFlux( it, time, faceQuadInner, faceQuadOuter, quadPoint, 

dune/fem-dg/operator/dg/primaldiscretemodel.hh

@@ -604,7 +604,7 @@ namespace Dune {
                          JacobianRangeType& gDiffLeft,
                          JacobianRangeType& gDiffRight ) const
     {
-      if( ! model_.allowsRefinement( inside() ) )
+      if( ! model_.allowsRefinement( inside(), time ) )
         return 0.;
 
       // call numerical flux of base type