New features for Oppus

Features added to Oppus/LOST-OppNet:

- Sensors
- MessageFormatter now handles Message object conversion to other formats (JSON, CSV)
- Internet Mode in cooperation with ARodrigues
- Webservice integration
- Added ContentProvider to allow external communication
- GUI removal

Now LOST-OppNet is an "invisible" app that is installed on the Android device. It has a configuration screen to change multiple parameters. Most of these settings only are applied when the debug switch on AndroidPreferences is set to FALSE.