small bug broke the simplex refinement of hypercubes

[[Imported from SVN: r1818]]

grid/common/refinement/hcubetriangulation.cc

@@ -279,9 +279,8 @@ namespace Dune {
       {
         IndexVector indices = backend.vertexIndices();
 
-        int base = kuhnIndex * BackendRefinement::nElements(level);
-        for(int i=0; i <= dimension; ++i)
-          indices += base;
+        int base = kuhnIndex * BackendRefinement::nVertices(level);
+        indices += base;
 
         return indices;
       }