Adding font+ / Font - to graph panels

modeling/AVATAR/testDependencyGraphs.xml

src/main/java/myutil/GraphicLib.java

src/main/java/ui/ActionPerformer.java

src/main/java/ui/GTURTLEModeling.java

src/main/java/ui/GraphPanel.java

src/main/java/ui/MainGUI.java

src/main/java/ui/TDiagramPanel.java

src/main/java/ui/TGComponent.java

src/main/java/ui/TGConnector.java

src/main/java/ui/TGUIAction.java

src/main/java/ui/graphd/GraphDEdgeConnector.java

src/main/java/ui/graphd/GraphDPanel.java

src/main/java/ui/graphd/GraphDToolBar.java

src/main/java/ui/graphd/GraphDVertex.java

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

ttool/src/test/java/myutil/GraphicLibTest.java

ttool/src/test/java/ui/TestTGComponent.java