[mcu_periph] sys_time: get_sys_time_msec and cleanup
[omap] Fix GPIO warnings
[vff] Disable debugging by default
[ardrone2] Fix AHRS propagate frequency
[ins] INS_PROPAGATE_FREQUENCY defaults to AHRS_PROPAGATE_FREQUENCY if defined
[conf] cleanup INS_ and AHRS_PROPAGATE_FREQUENCY
Merge branch 'master' of git://github.com/paparazzi/paparazzi