made /opt/paparazzi take precedence over /opt/local in makefiles to address some path issues, OS X specific
Merge pull request #179 from scdwyer/dev

fixes Issue #175
[airframe files] removed MAG_[XY|XZ|YZ]_SENS defines, they are never used anywhere
removed old/obsolete booz2 subsystem makefiles
[rotorcraft] force kill mode if ahrs is not aligned, even if RC is not used.
only read rc to check motors and in_flight if not in FAILSAFE or KILL mode
[bat_checker module] only compile for target ap
[gps_nmea] attempt to fix nmea parser at least a little bit
* fix gps.course
* fix gps.lla_pos
* fix altitude: it is in mm
* compute gps.ecef_pos for rotorcrafts
* added subsystem for rotorcrafts
[gps_nmea] if fix is reported as 1, it is really no fix, was correct before
[gps] set gps.utm_pos.alt correctly
it was zero because utm_f.alt was never written anywhere
[math] in function utm_of_lla_f: copy altitude from lla
[gps_nmea] read hdop and use it as pdop, better than nothing
Merge branch 'dev' into locm3
* luftboot is now used by default for lisa_m_2.0
* some smaller fixes and improvements from dev
[gps_nmea] fix start index of msg_buf, where parsing starts
now the gps fix should be read correctly
Made luftboot handling the locm3 way without messing around with the linker script.
Fixed compilation of lisa/m 2.0 boards with locm3.
[modules documentation] Add a doc node to module

modules developpers can provide
- a description of the module
- a list of the configuration variables and flags (configure and define)
- a list of sections to add to the airframe file
Merge pull request #182 from gautierhattenberger/doc

Modules documentation
Updated to the newest locm3 revision.
Corrected ADC channel definitions to be locm3 compatible.
Ported ppm radio control driver to libopencm3.