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

[Paul Norman]

Mosat maps prefer placing link roads below non-link roads. This allows them to do so without complex SQL or multiple layer solutions which break layer tag usage.

z_order per layer has also been increased from 10 to 100 to allow for this more fine-grained ordering.

Other types of roads (tracks, paths, etc) have been added. This does not impact those not using z_order for layers with these, but does allow their use.

It also removes highway=minor handling, which is a disused tag.

Fixes #132

@math1985, as you are more familiar with appropriate ordering of roads, could you review this? I'd like to deal with #132 for 0.88.0 which is probably coming soon.

I'm not attempting to replicate the osm-carto behavior for railways, as what we're doing with a `UNION ALL` is fairly specific and might not be generally applicable.
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/osm2pgsql/pull/374

-- Commit Summary --

  * Change z_order of link roads and add tests

-- File Changes --

    M .gitignore (1)
    M Makefile.am (4)
    M docs/migrations.md (9)
    M tagtransform.cpp (48)
    A tests/test-output-pgsql-z_order.cpp (186)
    A tests/test_output_pgsql_z_order.osm (75)

-- Patch Links --

https://github.com/openstreetmap/osm2pgsql/pull/374.patch
https://github.com/openstreetmap/osm2pgsql/pull/374.diff

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