Fix for magneto fix that still kept hanging sometimes
[ardrone2] count imu_lost and report filter status
Merge pull request #1025 from paparazzi/ardrone2_mag_fix

Chose this one over mine, if it is not working will add a fix, whatver the fix will be and then merge it again
last_checksum_wrong is always FALSE. And probably a bad idea anyway.
[modules] nav_survey_poly_osam: sweep improvements

Added half U-turn even if not sweepback
Some modification to change sweep distance and number of points using telemetry parametrers
option to use default 1/2 sweep distance for start line or using alternative 1/32 sweep start

Its is very useful when using poligon survey osam for photogrametry

closes #938
[conf] update settings_modules in confs