[rotorcraft] failsafe and ground_detect

- always reset ground detection
- KILL if in FAILSAFE and not in_flight anymore
[math] dox cleanup
[airframe] Lisa-S enable possibility for auto-takeoff
[SuperBifRf] Smaller Message for vertical loop tuning
[airframes] TUDelft IMAV Entries
[Module] Flight time left
[board] Fireswarm
[Ocaml] Block and Setting numbers
[ArDrone] Navdata decoder update (incl sonar)
Merge branch 'master' into tudelft5.0

Conflicts:
	conf/airframes/TUDelft/IMAV2013/ARDrone/184_calib.xml
	conf/airframes/TUDelft/IMAV2013/ARDrone/186_calib.xml
	conf/airframes/TUDelft/IMAV2013/ARDrone/188_calib.xml
	conf/airframes/TUDelft/IMAV2013/ARDrone/189_calib.xml
	conf/airframes/TUDelft/IMAV2013/ARDrone/190_calib.xml
	conf/airframes/TUDelft/IMAV2013/ARDrone/191_calib.xml
	conf/airframes/TUDelft/IMAV2013/ARDrone/193_calib.xml
	conf/airframes/TUDelft/IMAV2013/ARDrone/194_calib.xml
	conf/airframes/TUDelft/IMAV2013/ARDrone/195_calib.xml
	conf/airframes/TUDelft/IMAV2013/ARDrone/196_calib.xml
	conf/airframes/TUDelft/IMAV2013/ardrone2_raw.xml
	conf/messages.xml