added number of holes.

[[Imported from SVN: r4237]]

fem/common/dofmapperinterface.hh

@@ -51,10 +51,10 @@ namespace Dune {
       return asImp().numDofs();
     }
 
-    //! returns true if index is new ( for dof compress )
-    bool indexIsNew (int num) const
+    //! return number of holes in the data
+    int numberOfHoles() const
     {
-      return asImp().indexIsNew(num);
+      return asImp().numberOfHoles();
     }
 
     //! return old index in dof array of given index ( for dof compress )