Add some JavaDoc / code rearrangements

src/de/tud/kom/p2psim/impl/topology/movement/modularosm/mapvisualization/IMapVisualization.java

@@ -27,6 +27,10 @@ public interface IMapVisualization{
 	
 	public void paint(Graphics g);
 
+	/**
+	 * Retreives the current map as image.
+	 * @return image of the current map
+     */
 	default BufferedImage getMapImage()
 	{
 		return null;