mavlink: report global position setpoint and do this always no just when updated, otherwise the values are not visible in QGC
mavlink: put update call back in
Merge pull request #1054 from PX4/hil_pos_sp

Enable global position setpoint over USB
Merge remote-tracking branch 'px4/master' into navigator_rewrite
Merge branch 'navigator_rewrite' into navigator_rewrite_estimator