rc_channels topic cleanup
position_estimator_inav: don't change local z on first time ref initialization
Merge branch 'master' into mpc_in_flight_lock
Merged master into mpc_in_flight_lock
Merge pull request #1011 from PX4/mpc_in_flight_lock

position_estimator_inav: handle in-flight GPS fix properly
Merge pull request #984 from PX4/rc_channels

rc_channels cleanup
Merge branch 'master' of github.com:PX4/Firmware into prearm_checks