* Open in Key
* repair matching of updates
* assignment hooks

* Menu entries for debugging

* fixes of NPE
* connect UI to DebuggerFramework
* add frames combobox and context analysis
  * including bugs

Now, testing the big things!

Interim state: some minor modifications at DebuggerMain and first part of semiseq matching, next part follows tomorrow

* works, but needed some adaptions or fixes

New Tabs loadable and concept for loading a file again is implementend: if file is already laoded and loaded again, it is overwritten (Decision for the beginning)

* log4j
* HistoryListener.java enhanced
* Pull line hightlightning from JavaArea.java