OP-1413 - Land flight mode is actually not a finished auto landing system but rather a PH hack, thus it needs to be disabled from gcs until it is will be implemented properly.
OP-1358 Revo:Implement roll/pitch trim settings separated from "nominal" board rotation settings
OP-1358 Update level trim code to use the newly provided fields
OP-1412 change initial gyro bias uncertainty variance setting

from 1e-4 to 1e-6 to allow more stable filter initialization.
this is now valid thanks to available temp compensation and gyro bias
calibration in GCS
OP-1412 delay ekf initialization until magnetometers are reporting valid data
OP-1412 change systemalarms to update periodic to not loose data
OP-1412 do not dicard mags after init
Merge branch 'corvuscorax/OP-1412_Gyrodrift_issue' into rel-14.06
Merge remote-tracking branch 'origin/amorale/OP-1358_add_separate_rotation_calibration_offset_revo_only' into rel-14.06
fix WhatsNew for release