compare xml functions added

src/main/java/ui/MainGUI.java

.../java/ui/interactivesimulation/JPanelCompareXmlGraph.java

src/main/java/ui/interactivesimulation/SAXParserHandler.java

src/main/java/ui/interactivesimulation/TableRenderer.java

src/main/java/ui/tree/JDiagramTree.java