[Tile-serving] [osm2pgsql] Good cheaper indexing (#171)

[Paul Norman]

> I do also wonder if it were beneficial if one could instruct osm2pgsql to create more specific (partial) indexes to simplify initial imports.

That's #166. This issue was created about btree index techniques, which my testing has shown is seldom worth it for map rendering.

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https://github.com/openstreetmap/osm2pgsql/issues/171#issuecomment-55714545
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