[Tile-serving] [osm2pgsql] Add abandoned: tags to phstore list (#86)

[Paul Norman]

The non-abandoned version of these tags are areas, so the abandoned
ones should be too.

Necessary for hotosm/HDM-CartoCSS#126.

Also defines area:highway as an area in default.style

Test results might need tweaking, but the tests are failing for me for unrelated reasons.
You can merge this Pull Request by running:

  git pull https://github.com/pnorman/osm2pgsql abandoned

Or you can view, comment on it, or merge it online at:

  https://github.com/openstreetmap/osm2pgsql/pull/86

-- Commit Summary --

  * Add abandoned: tags to phstore list

-- File Changes --

    M default.style (10)
    M empty.style (7)

-- Patch Links --

https://github.com/openstreetmap/osm2pgsql/pull/86.patch
https://github.com/openstreetmap/osm2pgsql/pull/86.diff
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