Adapted to new grid interface

[[Imported from SVN: r2530]]

fem/discreteoperatorimp.hh

@@ -119,8 +119,8 @@ namespace Dune {
         this->level_ = grid.maxlevel();
 
         // make run through grid
-        LeafIterator it     = grid.leafbegin ( this->level_ );
-        LeafIterator endit  = grid.leafend   ( this->level_ );
+        LeafIterator it     = grid.template leafbegin<0> ();
+        LeafIterator endit  = grid.template leafend<0>   ();
         applyOnGrid( it, endit , arg, dest );
       }
       else