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

[mboeringa]

> 
> 
> Force pushed to rebase on master.
> 
> Now uses command line option `--middle-way-node-index-id-shift` instead of the environment variable `OSM2PGSQL_WAY_NODE_INDEX_ID_SHIFT`.

@joto ,

While the name of the command line option may be an accurate description of what the option does, it is rather unhelpful to the novice user of osm2pgsql...

Wouldn't it be a better idea to call it something like:

**--save-node-index-space
--reduced-node-index**

or something similar, and then describe in the Help pages what it actually does? Even for the current 
`--middle-way-node-index-id-shift` 
it will need a decent explanation of what it does and why its useful, at least describing it reduces temporary disk space at the cost of slightly slower imports.

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