added libtomcrypt library
added libtomfastmath
added auth command
auth: use get_board_serial() interface
mpu6000: added logging of good transfers

this helps tracking down a startup issue
drivers: allow forcing the safety switch on

This allows forcing the safety switch to the on position from software
which stops the pwm outputs
sdlog2_dump: Fixing incorrect tabbing to allow for CSV generation
airspeed: use _retries=1 for I2C retries once initialised

airspeed sensors often need to be on longer cables due to having to be
outside the prop wash.
mixer: fixed stream handle leakage
px4iofirmware: fixed override when FMU dead 

this allows for immediate override if the FMU dies without requiring
that the override RC channel be in a particular position
px4io: added RC_CONFIG, SET_OVERRIDE_OK and CLEAR_OVERRIDE_OK ioctls

this allows for full setup of RC override without needing param_get()
to PX4 specific parameters
px4io: publish pwm values when STATUS_FLAGS_FMU_OK is not set

this allows testing of FMU failure behaviour in px4io by monitoring
the reported PWM output when the vehicle code stops sending
updates. Otherwise testing needs to be done with "px4io status" which
is very tedious.

With this change a GCS can monitor the PWM outputs from the failsafe
mixer using normal mavlink messages
px4io: fixed errno returns to be negative
px4io: added OVERRIDE_IMMEDIATE arming flag

this allows the flight code to choose whether FMU failure gives
immediate manual pilot control, or waits for the mode switch to go
past the override threshold
systemcmds: added reflect command for USB testing
px4io: only check SAFETY_OFF, not OUTPUTS_ARMED for allowing mixer changed

If we check OUTPUTS_ARMED then we can't update trim values and scaling
in flight, as there is no way to clear OUTPUTS_ARMED.

If safety is on then it should be perfectly safe to update the mixer
and RC config
ORB topic for drive testing requests
cmd line utility for controlling drive tests
added px4flow integral frame, adjusted px4flow i2c driver, adjusted postition_estimator_inav
Fixed formatting of flow driver