0.9: Added toolbar. Added conection dialog. Added preferences. Added radio
     doppler control via plugins. Added station visibility display.
     Added command execution at AOS and at LOS.

0.8: Added orbit number display. Added status bar. Added command line option to
     display a grid 30x30 deg.

0.7.5: Bugfix release. Fixed overlapping of labels and font size problems.
       Network functions rewritten and implemented network error handling.
       Added orbit number display. Added status bar.

0.7: QTH and callsign drawing. AOS/LOS event indication. Added command line
     options for UTC time or localtime display. Added command line option to
     specify the predict server host.

0.6: Orbit drawing. Network connection optimization.

0.5: Initial public release
