[Tile-serving] [osm2pgsql] Move to modern geometry types (#309)

[Paul Norman]

osm2pgsql currently uses [`AddGeometryColumn`](http://postgis.net/docs/manual-2.1/AddGeometryColumn.html), `geometry_columns`, which are fragile and error-prone compared to modern type-based checking.

This would break PostGIS 1.5 compatibility. PostGIS 1.5 is end of life.

See https://github.com/openstreetmap/osm2pgsql/pull/279#issuecomment-77034639

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/osm2pgsql/issues/309
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