Prevent flips at high throttle

Conflicts:
	src/drivers/ardrone_interface/ardrone_motor_control.c
position_estimator_inav: critical bug fixed
commander: switch to AUTO_READY or AUTO_MISSION immediately, don't try to stay on ground
Speeded up IO startup, needs review
Cleanup of detect return
Fixed build error
There was a bug in position_estimator_mc. Solved
Topic has been changed for quaternion-based attitude controller.
Bug in so3 estimator related to R matrix
Remove unused tones and save about 6K flash space

- Comment out unused tones
- Create symbolic tone numbers rather than hardcoded
Fix parameter range check
Allow tone_alarm cmd to use tone names as well as number

- remove script dependency on hard coded tone numbers
- fix bug restarting repeating tone after stop
Merge pull request #368 from jean-m-cyr/master

Remove unused tones and save about 6K flash space
Hotfix for mavlink logbuffer, needs another round of validation.
Added logbuffer free function
Hotfix: Better PX4IO detection feedbak
Hotfixed position control param update
Hotfix: Correct frame print string
Hotfix: Cleanup on startup scripts
Hotfix: Rely on gyro calibration