[Tile-serving] [osm2pgsql] Allow Unsuperseeded Way Tag Updates (#230)

[Paul Norman]

> yep we thought if no one wants to allow this in osm2pgsql we would do a post processing step similar to what you are saying using the middle tables

I should note that you can actually do this from only rendering tables, but it's a headache thanks to long linestring splitting. see https://github.com/gravitystorm/openstreetmap-carto/issues/596#issuecomment-47410719

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