update get attraction point instances

src/de/tud/kom/p2psim/impl/topology/movement/modularosm/attraction/AttractionPointImpl.java

@@ -115,4 +115,12 @@ public class AttractionPointImpl extends PositionVector
 		return true;
 	}
 
+	public static Map<String, AttractionPointImpl> getInstances() {
+		return instances;
+	}
+
+	public static void setInstances(Map<String, AttractionPointImpl> instances) {
+		AttractionPointImpl.instances = instances;
+	}
+
 }