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

[Paul Norman]

z_order is included for railways - see https://github.com/pnorman/osm2pgsql/commit/a2f5b94560f70314340da4419b3e7aac58bc00e0#diff-0bc6697e58518b9e4450d6a128bd8790R84

I've had trouble replicating the broken z_order behavior with osm2pgsql master, since osm-carto now works around it. I see that the HOT style has problems at http://www.openstreetmap.org/#map=17/51.67413/5.32917&layers=H, so I'll try that.

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/osm2pgsql/pull/374#issuecomment-119468193
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