extend integrator reset flags in uorb attitude setpoint topic to all axes
fw att control: reset integrators when requested via attitude setpoint topic
fw pos control: set integrator reset flags in attitude setpoint topic, set them to true when launchdetection is running (while waiting for launch)
Merge remote-tracking branch 'upstream/master' into launchdetectorreset
fw pos ctrl: move setting of attitude integral reset flag
fw pos ctrl: remove comments
commander: Make mavlink_fd in arming command non-optional
Add mavlink_fd to all commander arm transitions to provide user feedback why the arming command failed
Merge pull request #1073 from PX4/launchdetectorreset

FW: reset attitude control integrals in launchdetection mode (when waiting for takeoff)
Merge pull request #1077 from PX4/arming_feedback_fix

Arming feedback fix
mavlink: Always send heartbeat and do not require both topics to update
Merge pull request #1080 from PX4/hb_fix

mavlink: Always send heartbeat and do not require both topics to update