OA_GROUP_FIELD does not exist on most content, use OG_AUDIENCE_FIELD
Mixup of flags and users disabling notification settings
Missing sync to head - exchange CONST name for same value
Missing sync to head - exchange CONST name for same value - again
Sync to upstream
Merge pull request #6 from ChristianAdamski/7.x-2.x

Notification settings on flagged content useless