fix to use ins_alt_dot with baro wen USE_BAROMETER is defined
[modules] baro_board: only call event handler if there is new data
[modules] fix warning in baro_board
[modules] baro_amsys: fix for DT to match BARO_READ_PERIODIC_PERIOD
[modules] BARO_x_DT from generated BARO_x_PERIODIC_PERIOD
[modules] baro_amsys: comment to match the other baro sensors
Merge pull request #499 from TobiasMue/ins

fixes to use ins_alt_dot with baro wen USE_BAROMETER is defined