Port expander driver first hacky version
position_estimator_inav: remove acceleration from state and INAV_W_XXX_ACC parameters, more NaN checks
Merge pull request #1009 from PX4/inav_fix

position_estimator_inav: stability fix
Merge branch 'master' of github.com:PX4/Firmware into pca8574
PCA8574 driver: Cleanup, ready for final testing and production
Enable the driver as default for boards having it
PCA cleanup: Full interfaces ready for AP use
Merge pull request #1024 from PX4/pca8574

PCA port expander
Minor fixes to MAVLink
Merge pull request #1026 from PX4/mavlink_fixes

Minor fixes to MAVLink
ubx driver: fix unit of speed and position accuracy estimate
Merge pull request #1029 from PX4/ubxaccuracyunit

ubx driver: fix unit of speed and position accuracy estimate
mtecs publish state
Merge remote-tracking branch 'upstream/master' into mtecs
sdlog2: log mtecs mode