[tools] gen_modules_doc: update wiki url
[dox][mcu_periph] document some more stuff
update excludes in Doxyfile

and prevent copied chibios file to add doxygen groups
[airborne] remove unused agl and alt_vfilter

alt_vfilter is basically the same as ins/vf_float
[server] add airspeed data in FLIGHT_PARAM message
[server] send negative value if no airspeed available

on a second thought it is safer to tell that there is no airspeed data,
ground speed is already available in the message anyway
[server] change again airspeed field position

for compatibility with PPRZonDroid beta version
[rotorcraft] rc setpoint handling refactored

closes #684 which partially solves #599
[mission] add support for global coordinates in mission module
Merge remote-tracking branch 'paparazzi/master' into testing_iridium

master sync