Changes to make ARDrone2 SDK fly without joystick
dirty fix to fly without joystick. Because autopilot_on_rc_frame is now only called once, please make sure you first have GPS fix because you launch the autopilot software, or RELAUNCH it after you have acquired GPS FIX, so that you will get in NAV mode. When you lose GPS FIX you will switch back to SAFE, where you will be stuck again. I know this is dirty, pprz rotorcraft logic has to be rewritten carefully for it to work nicely without RC.
Added check if autopilot_motors_on do determine if you want to switch to AP_MODE_FAILSAFE
[ardrone] Battery readout for ardrone RAW, needs a little tweaking to perfect it. Measure a fully charges battery and a depleted one with a multimeter and with this voltage readout. Derive a function that maps the 10bit adc value to the actual voltage more accurately from the readouts.
Merge branch 'master' of github.com:dhensen/paparazzi