MAVLink: update to latest upstream message defintions XML

this adds new HIL support for airspeed, and common SIM_STATE and
RADIO_STATUS messages
Plane: update takeoff course when conditions met

This allows for change of heading before the final takeoff conditions
are met

thanks to Greg Fletcher for suggesting this
Plane: update FS_LONG_ACTN and FS_SHORT_ACTN docs

thanks to Craig for noticing this
Fix test_ins

Fix output format of test_ins and fix the number of parameters passed
to printf
transfered changes from wrong branch
Merge remote-tracking branch 'diydrones/master' into OpticalAltimeter