Publish telemetry status on telemetry update and on heartbeat update events to avoid inducing heartbeat update latencies resulting in spurious telemetry link dropped detections. Makes overall state handling simpler
Merge pull request #1284 from PX4/telem_status_reactive

Publish telemetry status on telemetry update and on heartbeat update eve...
Airspeed fix attempt
Mag scale check: only test if the scale roughly makes sense, do not judge the environment
Time out after a reasonable interval (10 seconds, as e.g. OBC rules prescribe). Experiments show the SiK radios to time out ~4-7 seconds if they loose sync
Do not perform retries in airspeed driver - this is too much load for the HRT queue
Merge branch 'master' of github.com:PX4/Firmware into as_fix
Merge pull request #1292 from PX4/as_fix

Airspeed fix attempt
Merge pull request #1293 from PX4/timeout_fix

Timeout fix
Merge remote-tracking branch 'upstream/master'