added updategroup flag for func UpdateGroup() #36
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User story (mine): When i'm on vacation, i don't want messages from our monitoring system. Therefore leaving the group for a short period of time instead of just muting will also save precious mobile data and battery. Back at work, i want to re-join without asking my colleagues (which might have lost their phone/Signal ID/whatever). Server's Signal ID is being backed up and a single point to re-add myself.