[Enhancement] Display one Pin in multiple pinwalls

[dknx01]

Hi, this app is great, but I would like to have one pin in more than one pinwall, wther by copy it or share it to another wall.
Example: I have two walls, one for "Great Places for Drinking" and one for "Great Places with Live Music". Sometimes one location belongs to both walls.
At the moment it create two pins (oe for each walls) or copy the tntry in the database. Maybe doing this in the frontend would be fine.

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