[Tile-serving] [osm2pgsql] Reduce memory usage of node cache (#360)

[Sarah Hoffmann]

Basically all possible combinations of --slim, --flat-nodes and --cache-strategy. The latter in particular is badly covered with the regression tests.

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/osm2pgsql/pull/360#issuecomment-112696449
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