Don't delete widget that is owned by another widget.
Add a couple of failure and disagree flags to EFIS.
Add 'serviceable' flag to BMP085 pressure/temperature sensor.
Treat nil serviceable flags as OK. Assume things work.
Add BeagleBone Black profile ('bbb') to Makefile.
Don't display heading indicator on HSI when it's nil.
Don't estimate IAS until it has reached minimum value.
Workaround Qt B/W cursor bug.
CHR-UM6 attitude, acceleration and magnetic sensor. Needs fixing, though.

Also update configs.
Cleaning up. Refactoring small things. Removing unnecessary code.
Fixes for EFIS.

* Change some properties to "settings".
* Add configurable altitude emphasis (default per 1000 ft).
* Paint hollow diamond if track deviation is > 2.25°.
* Rename property "altitude" to "altitude.amsl".
* Rename 'warning' speed to minimum-maneuver speed,
  and add maximum maneuver speed.
* Rename all 'cbr' and climb rates to 'vertical speed'.
Make fonts on FMA (EFIS) a little bit bigger.
Don't draw leading '0' on Mach indicator (EFIS).
Cleanup EFIS property names.
Add "old" style to EFIS.
Fix io/flightgear to use PropertyTemperature.
AirDataComputer (systems/adc) separated from FDC.
NavigationComputer (systems/nc) separated from FDC.
Let EFIS use computed track instead of alpha/beta to display FPV.
Allow recursive <directory> elements in module config.