[module] sonar_maxboitx -usable with fixedwing or rotor -output: distance in m (the module sonar_maxbotix_booz) is unefected
[lpc21][ppm] fix RC_PPM_SIGNED_TICKS_OF_USEC
[datalink] add a simple mavlink decoder
[px4flow] px4flow optical sensor driver
[airframe] update airframe using px4flow in place of the GPS

just sending the values on telemetry, not connected to the flight control
[ppm] really fix signed ppm stuff
Merge pull request #379 from gautierhattenberger/px4flow

Px4flow and mavlink decoder
[nps] fix time: initialize sys_time by adding missing PERIPHERALS_AUTO_INIT
cleaned the code and renamed the files to be consistend in to sonar_adc
[makefile] print paparazzi_version when building sim, remove throwing error on old UART_NR configure
[conf] remove nps settings file from Quad_LisaM2 example airframe, you can only include it if compiling nps
course is now correctly calculated
sonar_offset to m and clean up
Merge pull request #378 from TobiasMue/sonar

[module] sonar_adc -usable with fixedwing or rotor and distance output
[mavlink] fix crc function names for compatibility with libocm3
[peripherals] spi transactions: always set clock divider and bitorder
[stm32][spi] removed commented/unused stuff
[dox] update/add some more doxygen comments
[airborne] std.h: define NULL if not already done
debugging settings