[Tile-serving] [osm2pgsql] route_name tag (#315)

[Sarah Hoffmann]

The special handling for routes is rather old. The original commit is [here](https://github.com/openstreetmap/osm2pgsql/commit/5645aef1aa5643baa1f40473d5c0fd04e08e3471) and was done for the cycle map, I believe. It was never used by the mapnik style. @gravitystorm should know more details.

I suspect that a lot of maps that handle route relations still rely on this code. If we want to phase this out, it has to be long term thing (with announcements on dev@ etc.) and we should provide a lua style that emulates the old behaviour. Personally, I'm more for just leaving the C transform as is with all it's quirks, concentrate on making the lua tagtransform more efficient and promote that in the future.

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https://github.com/openstreetmap/osm2pgsql/issues/315#issuecomment-84283472
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