Version 0.13 released

Delayed, but I hope you will enjoy it. Changes since 0.13
- Bugfixes
- Configuration view
- Project table view
- Global feature view
- New and delete action
- Revised xml file format
- Added a lot of icons
- Kicked properties dialog (please use project table instead)
- Preview of deleted/created relations
- Improved maintanance of feature tree

(Thanks to Axel for the network card :-)