[Tagging] Big amenity=fountain

[Daniel Koć]

We try to make some conclusions regarding rendering fountains on default 
map:

https://github.com/gravitystorm/openstreetmap-carto/issues/705

The discussion is rendering centered, but we need some tagging hints to 
resolve it properly.

The main issue is that some fountains are in fact big (named) area with 
many nozzles. This leads me to render amenity=fountain with just a name 
and an icon, not including water basin (which can be reasonably tagged 
as water=*) and maybe all the individual nozzles tagged as 
amenity=nozzle (and rendered as a blue dot, probably with an icon on 
maximum zoom level)?

Wiki page is currently not aware of big fountain issues:

http://wiki.openstreetmap.org/wiki/Tag:amenity%3Dfountain

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