added new param-editing to APs and Beacons

changed drawing for better debuging
changed layer editing
option to add and delete layers
some minor changes

mapview/model/MapModel.h

@@ -42,6 +42,13 @@ public:
 		cleanup();
 	}
 
+	/** create a new, empty root node */
+	void startEmpty() {
+		im = new Floorplan::IndoorMap();
+		root = new MMRoot(nullptr, im);
+		//root->addSublayer(new MMFloors(root, im));
+	}
+
 	void cleanup() {
 		selLayer = nullptr;
 		//selElements.clear();