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

[Paul Norman]

performance wise, issuing a bunch of UPDATEs to lines in relation processing is probably going to be a headache. this won't impact those not using that feature, but is of concern to you.

The current superseeded processing is really based around multipolygons where you want to get rid of the way. Updating raises the case of a way being part of multiple relations, which is tricky to handle right.

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https://github.com/openstreetmap/osm2pgsql/issues/230#issuecomment-66463627
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