[log] add option to log raw invariant filter inputs and outputs
[usb] improve usb storage

° when an usb is plugged, wait for an usb-storage cnxion, then
  stop the autopilot to reserve cp for usb-storage thread.
  Yes, we should avoid false detection, so there is two level of detection
  before shutting down autopilot thread.

remove spurious white char @ eol
[rotorcraft] MOTOR_MIXING_MAX_SATURATION_OFFSET defaults to 10%
[modules] fix baro_bmp
[conf] cleanup flash_modes
[math] add SV decomposition and make proper functions
[fix] set lower number of decimal to log (was exceeding  buffer size)
[math] fix compilation with g++ (for nps)

this solution is not really nice and consume a bit more space, if
anyone have a better idea...
[fix] node name for modules' datalink event
[math] add some more dox
[conf] some joystick cleanup

- RC_4CH message does not have a joystick_id field
- there is no rc_dl_active_joystick anymore
- aurora_skate_controller is out-of-date/non-functional
[ground_segment] input2ivy: improve error messages
[sys_time] fix get_sys_time_usec with chibios
[extra_dl] make extra pprz telemetry work even if transparent telemetry is not used
[sdlog] SDLOG transport for logging directly using telemetry macros

compatible with sd2log tool to extract data
[meteo] add Meteo France DAQ board driver

get data from DAQ board and log on SD
send report to the ground for real-time monitoring
[Makefile] add pcre lib to jsbsim, cleanup shell commands
[logalizer] fix missing tab in makefile
[jsbsim] ahrg, fix LDFLAGS
[gps] add gps_periodic_check to reset fix after timeout

- GpsIsLost should eventually be replaced by isLocal/GlobalCoordinateSystemValid from state interface

closes #637