Added mesh cast for meshes with different but identical traits.

git-svn-id: http://www.openmesh.org/svnrepo/OpenMesh/trunk@920 fdac6126-5c0c-442c-9429-916003d36597

src/OpenMesh/Core/Mesh/AttribKernelT.hh

@@ -73,6 +73,8 @@ public:
 
   //---------------------------------------------------------------- item types
 
+  typedef MeshItems MeshItemsT;
+  typedef Connectivity ConnectivityT;
   typedef typename Connectivity::Vertex     Vertex;
   typedef typename Connectivity::Halfedge   Halfedge;
   typedef typename Connectivity::Edge       Edge;