[Tile-serving] [osm2pgsql] Change z_order of link roads and add tests (#374)

[Paul Norman]

After talking to other cartographers, most people are either working around the current osm2pgsql z_order or consider it a bug. This method seems the best of the changes.

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/osm2pgsql/pull/374#issuecomment-120580226
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