Signals cannot be overridden in subclasses.
Merge branch 'master' of https://github.com/mavlink/qgroundcontrol
Updated QUpgrade, fixes #769
More qupgrade fixes
FileManager: whitespace only
Fix device listing on Linux
FileManager: hack to filter out images for video downlink
Merge pull request #770 from mavlink/fix_videotransmission

Fix videotransmission
Fixed debug console location, still ugly (style sheet handling)
Fixed missing preferences menu
update sub
Merge branch 'master' of https://github.com/mavlink/qgroundcontrol