clone currentView -graph, so each requester gets a different object

src/de/tud/kom/p2psim/impl/topology/DefaultTopologyComponent.java

@@ -643,7 +643,7 @@ public class DefaultTopologyComponent implements TopologyComponent {
 		 */
 		public Graph getLocalView() {
 			recalculateLocalView();
-			return currentView;
+			return currentView.clone();
 		}
 
 		@Override