[conf] hff and geomag for quadrotor_lisa_mx.xml
[rotorcraft] count motor_mixing saturation cases

and send them in ROTORCRAFT_STATUS motor_nb_error.
One combined lower and upper saturation (nb_failer) counts 10 times as much.
[modules] gps_ubx_ucenter, extra flag PRINT_DEBUG_GPS_UBX_UCENTER

which should only be used on platforms with printf support (e.g. linux on AR Drone) or when using semi-hosting
[doc] Two simples updates int the documentation of the project.

Recompiled the paparazzi algebra documentation to include the refs to the images in the file.

Updated the link to the wiki in the readme of the controle loop documentation.

closes #668
[export] fix datalink export (missing file)
[MF_DAQ] update and fix mf_daq module

- use telemetry message
- fix datalink event
- protection for memcpy max size
[gcs] fix AGL display in edit waypoint box

also fix a strange bug where set_adjustment function doesn't correctly
display the actual initial value (but it was correctly set, only display
was 0.)
[sonar] sonar system using ABI interface

- unified interface for sonar (sonar_adc was broken with latest commit
  for ardrone)
- median filter removed from ins_int, implement in sonar drivers if
  needed
- compiles but not tested yet
[ins] remove obsolete ins update functions on baro and sonar
[sonar] fix some sonar related issues
[ardrone2][baro] optional median filter on baro

some crazy values can remain, it seems that they are well filtered using
this median filter
[makefile] AHRS frequency flags where missing for ardrone2
[export] filter message list in log export popup
[tmtc] silent warning when no FP selected and add makefile dependency
[gps] Add a new GPS based on the datalink
[fms_network] Added multicast support
[ground_segment] Added NatNet to ivy service
[ahrs] Made it possible to set the course deviation of the GPS
[ins] Made it possible to use GPS altitude
[ardrone] Updated gains and reference model for inside