[OSM-dev] Default map style on osm.org

[Christian Quest]

It is really difficult to answer two really different needs:
- a map for mappers: so that they can quickly see their contributions,
- a map for non-mappers: here some less cluttered rendering is needed, and
different styles needed depending of the use

I've always considered the default osm.org map rendering as a "work"
rendering, mainly designed for the mappers and that's what I explain when
people are a bit negative about it.

A good move has been to add zoom 19 on osm.org, it answers a need for
mappers in very dense area where overlapping features could not be rendered
at zoom 18.

I've forked the osm-carto style for OSM-FR and to try to address both need
(a generic map for non mappers and a detailed one for mappers) here is what
I've mainly done:
- have better looking first zooms: for example use a lowzoom bitmap of
landuse (based on an idea from Frederik Ramm), fill "empty" area with
village names, add some geographic toponyms like main islands, archipelago,
etc
- simplify intermediate zooms: automatic abreviation of names, use of
meaningful localized symbols
- show more details on additional zooms (19 and 20)

You can see the result on
http://tile.openstreetmap.fr/?zoom=5&lat=47.71461&lon=3.04866

Some parts could be reused for osm.org (first zooms for example).
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