[Tile-serving] [osm2pgsql] Add an option to specify the target schema for import (#279)

[Sarah Hoffmann]

Copying from #279.

Running `osm2pgsql -as -S default 500.osc` on a database with one installation in the public schema and one in a custom one, the update fails with:
~~~
Setting up table: planet_osm_point
Osm2pgsql failed due to ERROR: Problem reading geometry information for table planet_osm_point - does it exist?
~~~

Problem is that the lookup for geometry information [here](https://github.com/openstreetmap/osm2pgsql/blob/master/table.cpp#L109) expects exactly one result back while now I have two tables planet_osm_point. The schema needs to be added to the query there. There might be other meta queries that experience the same problem.

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/osm2pgsql/pull/279#issuecomment-77034639
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