[isa] conversion tools from pressure to meters
[abi/baro] binding to ABI baro message is compiling
[baro] data are send and received with ABI (works on a navgo)
[isa] atmosphere function all in float
[abi] pass sender id in the callback function
[air_data] introduice air_data subsystem

- split air data structure and baro interface
- keep baro interface for integrated baro board
- replace BOARD_HAS_BARO by USE_BARO_BOARD
- add air data and baro_board to both firmwares
[ins/baro] pressure in float in ABI messages
[baro] update baro_board files for ABI

- except most of the lisa boards since I'm waiting for another work to
  be merged into master
Merge remote-tracking branch 'paparazzi/master' into baro_abi

Conflicts:
	sw/airborne/boards/lisa_m/baro_ms5611_i2c.c
	sw/airborne/boards/lisa_m/baro_ms5611_spi.c
[baro] convert remaining baro_board to ABI
[boards] fix baro for lisa_m
[dox] doxygen headers for abi
[baro] convert baro modules to ABI
Merge remote-tracking branch 'paparazzi/master' into baro_abi

Conflicts:
	sw/airborne/boards/ardrone/baro_board.c
	sw/airborne/modules/sensors/baro_ms5611_spi.h
[baro] convert new boards to ABI for baro
[ins] conver alt_float ins to ABI for baro
[baro] fix baro ABI for sim target with amsys sensor
[message] fix message format for BARO_RAW
[nps] sim proper baro pressure in pascal
[messages] INS_REF: baro_qfe in float