[Tile-serving] [openstreetmap/osm2pgsql] possible optimization, dynamic increase of work_mem (#1419)

[Stephan]

This is not about tuning the database server for operation. My work_mem setting is fine for this, as my tests proved.
It is about speeding up the import process run of osm2pgsql.

Probably I could do this manually: Increasing the setting before the import and reducing it later. But couldn't osm2pgsql do this for me as well? If not going for a fixed parameter, maybe offering a configurable cmdline, like the -C option?

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