Fixed (and added) layouting

Fixed in JGraphXAdapter
Added to KonTabbedPane
Changed documentation around a bit
Added a test for not listenable Graphs.
Added a test for adding duplicate edges and vertices to the graph.
Documentation; Removed tabs
Fixed missing removal of edges/vertices
Merge remote-tracking branch 'upstream/master'

Improved 'essential' checkstyle xml
Merge remote-tracking branch 'upstream/master'

Better checkstyle, again
Merge remote-tracking branch 'upstream/master'

Changed checkstyle file yet again, hopefully for the last time now
Removed final modifiers
Started working on mxListenerInterface

So JGraphX Events will be sent to the JGraphT graph.
Changed most mxCells to mxICells
Revert "Started working on mxListenerInterface"

This reverts commit 74e7584aa8c6dd65dfae36c04f8a471ec2601e68.
Stopped working on JGraphX -> JgraphT completely

Conflicts:
	src/de/konsteirama/jgraphxadapter/JGraphXAdapter.java
Missed one crucial character during merge...

...
:)
JgraphT EOF
Merge pull request #3 from SebiH/master

Final JGraphXAdapter changes