Added new clean function removing only primitives

git-svn-id: http://www.openmesh.org/svnrepo/OpenMesh/trunk@706 fdac6126-5c0c-442c-9429-916003d36597

src/OpenMesh/Core/Mesh/ArrayKernel.hh

@@ -303,8 +303,18 @@ public:
                           std_API_Container_FHandlePointer& fh_to_update,
                           bool _v=true, bool _e=true, bool _f=true);
 
+  /** \brief Clear the whole mesh
+   *
+   *  This will remove all properties and elements from the mesh
+   */
   void clear();
 
+  /** \brief Reset the whole mesh
+   *
+   *  This will remove all elements from the mesh but keeps the properties
+   */
+  void clean();
+
   // --- number of items ---
   unsigned int n_vertices()  const { return vertices_.size(); }
   unsigned int n_halfedges() const { return 2*edges_.size(); }