MP1-4304-User group thumb can't be changed
Merge branch 'master' of https://github.com/MediaPortal/MediaPortal-1 into MP1-4304-User_group_thumb_can_not_be_changed
Merge branch 'master' of https://github.com/MediaPortal/MediaPortal-1 into MP1-4304-User_group_thumb_can_not_be_changed