[Tile-serving] [openstreetmap/osm2pgsql] Way node index using shifted node ids (#1275)

[mboeringa]

> @mboeringa The ugly name is on purpose. Novice users should never ever set this, this is for experts only.

@joto, another question regarding this: is the 30% performance hit you report only for true osm2pgsql guided **updates**, so this performance hit is not relevant to users who do not to do updates but instead a full re-import to update their database?

If so, I would argue that it is more likely that novice users are in the second group, only doing full re-imports. Setting up osm2pgsql to do updates is likely the "advanced" option.

If that is the case, this option may actually be desirable for novice users, as it would reduce temporary disk space usage at no to little cost, and a slightly more user-friendly name an option.

Of course, if ordinary imports are affected as well with a 30% performance hit, than I agree this is more of an "advanced" option that should likely not be default.

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