[rotorcraft] attempt at some cleaner stabilization includes
[test] some python cleanup
[modules] Compile gps_ubx_ucenter.c independently.

closes #571
[tool] some more python cleanup
[math] minor update for math lib building

use PAPARAZZI_HOME and install to /usr/local by default
[conf][test] cleanup: remove old booz stuff
[simulator] cleanup: remove old_booz sim
[ahrs] float_mlkf: configurable mag measurement noise
[conf] fix/improve dependecy generation
[stm32] add support for TIM3,4,5,8 for ppm input

Thanks to Chris!
This finally closes #557
[paparazzicenter] move target button to menu and print simple error message
[paparazzicenter] add tooltip to 'new build target'
[GCS] Added outlines to labels on the 2dmap.
[GCS] Made the contrast label it's own class.

The outlines should now also be less jagged as I am covering all pixel
directions.
[GCS] Added outline to the aircraft icon.

Also extracted the aircraft icon into it's own class for future
expansion.
[GCS] improve icon handling

add new icon for rotorcraft and home
can be set from airframe file
using firmware name as possible default
[peripherals] initial LIS302DL driver
add some tests
[stm32][gpio] Add clock enable for ports E - I
[test] playing around with cython wrappers