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

[Paul Norman]

```
LD_LIBRARY_PATH=$HOME/boost/lib time ~/osm2pgsql/osm2pgsql -d gis \
  --cache 12000 --flat-nodes nodes.bin --slim --drop \
  --number-processes 8 -S ~/openstreetmap-carto/openstreetmap-carto.style \
  planet-150202.osm.pbf

...

Processing: Node(2715740k 2538.1k/s) Way(0k 0.00k/s) Relation(0 0.00/s)Switching to read mode
Switching to read mode done
Warning: reading node outside node cache. (18446744072741715967 vs. 200542)
Warning: reading node outside node cache. (18446744072741715967 vs. 274057218)
Warning: reading node outside node cache. (18446744072741715967 vs. 1024965354)
Warning: reading node outside node cache. (18446744072741715967 vs. 200550)
Warning: reading node outside node cache. (18446744072741715967 vs. 1024940305)
Warning: reading node outside node cache. (18446744072741715967 vs. 1024940306)
Warning: reading node outside node cache. (18446744072741715967 vs. 1024940307)
Warning: reading node outside node cache. (18446744072741715967 vs. 200551)
Warning: reading node outside node cache. (18446744072741715967 vs. 200553)
Failed to seek to correct position in node cache: Invalid argument
Error occurred, cleaning up
Command exited with non-zero status 1
```

---
Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/osm2pgsql/pull/360#issuecomment-113231028
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