entitypointer doesn't need to store the level itself

[[Imported from SVN: r2112]]

grid/uggrid/uggridentitypointer.hh

@@ -33,12 +33,10 @@ namespace Dune {
     }
 
     //! ask for level of entity
-    int level () const {return level_;}
+    int level () const {return virtualEntity_.level();}
 
   protected:
 
-    int level_;                       //!< level where element is on
-
     mutable UGMakeableEntity<codim,dim,GridImp> virtualEntity_; //!< virtual entity
 
   };