[Tagging] Estate agent

[Andreas Goss]

> how would we do this? What does it change? Btw., "lack of alternatives"
> really isn't a good argument in a project that allows "any tags you like".

> still those tagged in the amenity namespace don't miraculously change
> meaning just because someone has introduced an alternative tag in the
> meantime.

I'm not saying they changed their meaning. Ofc amenity=emergency_phone 
is still the same as emergency=phone. But people put it into the amenity 
tag back then, because emergency= didn't exist.

The point is more that shop was mainly used for services, because it was 
the closest key that existed. I also cleaned up craft= a bit and many of 
those could also be found as shop= and while some certainly have a 
overlap others really don't.
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