navigator: forbid READY - > RTL transition
navigator: forbid READY - > RTL transition fix
commander: reset blink_msg_end when blink message completed to set normal LED status immediately
commander: beeps and blinks cleanup
commander: play warning tune (as for low battery) when in failsafe state
commander: tunes cleanup and fixes
navigator: use bearing to home for RTL
sdlog2: TELE (telemetry status) message added, type for 'rssi' and 'remote_rssi' in 'telemetry_status' topic fixed to be consistent with 'noise'/'remote_noise' and mavlink message.
mavlink: bug in telemetry_status publication fixed
Merge pull request #661 from PX4/sdlog2_telemetry

sdlog2: TELE (telemetry status) message added
rc.fw_defaults: increase acceptance radius which is used by navigator to generate virtual waypoints (RTL etc.)
navigator mavlink log info messages: add #audio tag
Navigator: set loiter WP correctly
Commander: add guard for parachute deployment
Merge pull request #667 from PX4/fix_disable_parachute

Commander: add guard for parachute deployment
Fix base clock frequencies for timers 9/10/11 (not currently used).

Thanks to xiazibin@gmail.com for pointing these out.
decrease MC_PITCHRATE_P for TBS Discovery
Add a lot of MAVLink parameter documentation.
Layout fixes for wiki parameter documentation.
- Replace newlines in names and comments with a space.
- Right align min/max/default values.
Merge pull request #666 from PX4/fix_loiter

Navigator: set loiter WP correctly