adding i2c sonar, not compiling yet.
Compiling, todo: add USE_SONAR to sonar_i2c.xml,
adding telemetry for sonar sensor
Merge branch 'master' into sonar_i2c
Merge branch 'master' into sonar_i2c
adding sonar to rotorcraft telemetry
Merge branch 'sonar_i2c' of https://github.com/aerial-research-robotics/paparazzi into sonar_i2c
whatever
sending 0x51 aka 'take measurment' to sonar sensor
Merge branch 'sonar_i2c' of https://github.com/aerial-research-robotics/paparazzi into sonar_i2c
adding stuff to periodically executed function call
Merge branch 'sonar_i2c' of https://github.com/aerial-research-robotics/paparazzi into sonar_i2c
debbugging
Merge branch 'sonar_i2c' of https://github.com/aerial-research-robotics/paparazzi into sonar_i2c
7Bit adress contains 7 Bits, that have to be shifted by 1Bit

FUUUUUUUCK!
Merge branch 'sonar_i2c' of https://github.com/aerial-research-robotics/paparazzi into sonar_i2c
reorganising code
Merge branch 'sonar_i2c' of https://github.com/aerial-research-robotics/paparazzi into sonar_i2c
changing config
i2c adressing

using the read-address to read and the write-address to write