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

[Paul Norman]

I'm not convinced about changing railways to always be above all roads, instead of being above minor roads and below major ones.

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/osm2pgsql/pull/374#issuecomment-119805292
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