PX4/Firmware — pull request #974 by DrTon (2014-05-17 21:30:13+00:00)
Title: Position topics cleanup

Position / altitude topics rewrite. Need to keep minimum fields in each topic, avoid 'valid' flags and publish topic only when it contains valid data.

First need to edit only vehicle_altitude, vehicle_local_position, vehicle_global_position topics, then change estimators and controllers to use it.

@LorenzMeier, @thomasgubler, @julianoes, look please.