mpu6000: allow disabling of on-sensor low pass filter

used for vibration testing
ets_airspeed: fixed to add differential_pressure_raw_pa

thanks to hxxnrx for this fix!
px_uploader: added ModemManager warning
lsm303d: disable check_extremes code

this could trigger with a bungee launch, and could cause higher
latency due to SD card writes
Merge remote-tracking branch 'diydrones/master'