[Tile-serving] [osm2pgsql] use vectors of pointers in middle-ram to reduce memory footprint (#394)

[Sarah Hoffmann]

This is ready now. Tested with `./osm2pgsql -O null -C 16000 germany.osm.pbf`.

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/osm2pgsql/pull/394#issuecomment-122114012
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