[Tagging] Watermill attributes

[Zecke]

> Coming back to city walls. Our walls in Padova are massive, were built 
> mid 1500 and are still there. They are at present not tagged 
> "historic" and hence don't show up on the history map.

Thanks Volker for pointing us at that.  The citywalls are tagged 
correctly. However there was a bug in our selection mechanism which 
prevented them from being rendered as such. This should be fixed by now.

http://geschichtskarten.openstreetmap.de/historische_objekte/?zoom=14&lat=45.40335&lon=11.88057&layers=B00000000FFFFFFFTFFFTFFFT 


Cheers,
Zecke