Major updates

- All tasks, except outgoing sms, have some form of reporting:
	+ AsyncTasks --> mail
	+ BroadcastReceivers --> write in tmp file
- A first timer task, started in the main service, enables to update data stored in memory; a second enables to regularly send reporting on tmp file.

TODO:
- Add airplane and wifi classes
- Check Wi-Fi is turned on before sending mails
- Problems in GPS on Nexus, not on HTC
- Make OutgoingSms.java work...