Usergroup management: add a button "re-associate all POIs from that Archive to this Usergroup".

Usually the Archive was assigned to a Group to define their working area. The result was that when a new POI was created, it was associated with that Archive (in addition to being associated with the group).

This was great for new groups to catalog new content.

The new current use case is this:

• a new member joins the staff and you want to give him/her only a few POIs to manage.

In this case it would be enough to put the POI in an Archive, and then go to the group and assign it to that Archive.

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