[v0.2.0 Beta]

- [update] Updated QMapControl to version 0.9.7.6.
- [update] Changed some icons.
- [update] Some minor GUI changes.
- [new] Double clicking an item in the track selection opens the track
properties dialogue.
- [new] Added undo/redo functionality.
- [new] Added functionality to split and combine a track.
- [new] Window state and position is stored on application closing and
restored on restart.
- [new] Header state of point list is stored on application closing and
restored on restart.
- [new] Added control to change the map zoom.
- [new] Added option to configure the map caching.
- [fix] Docks don't disappear any more when tabbed.