Added a function to create a startpage.
Added a function to remove the startpage.
added a function to check if startpage is active.
Added functionality to create a new tab.
Added "Draw in new Tab" Button and moved the drawing from the
actionlistener to a method.
Added "Draw in new Tab" Button to InclusionResultDialog and moved the
drawing from the actionlistener to a method.
Added "Draw in new Tab" Button to OpenProblemDialog and moved the
drawing from the actionlistener to a method.
Added dummy interfaces for further integration

Need to be replaced later on
Formatting of GraphClassSelectionDialog

.
Added missing jgraphx dependencies to build.xml
Fixed build.xml ... again!

Should now include all dependencies
Added simplified version of drawinginterfaces

Need to be replaced later with the final implementations
More progress of the integration

Integration of tabbed pane as well as the DrawingLibraryInterface
TODOs and comments to make the project buildable

while the integration is going on
Added basic usersettings structure

Also added basic SettingsDialog and some TODOs
Fixed drawing in ISGCITabbedPane and adjusted method calls in
GraphClassSelectionDialog.
NamingDialog now changes the naming preference of the active tab.
Minor changes
Merge pull request #2 from SebiH/master

Basic integration of tabs, drawinglibraryinterface and options