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

[Jochen Topf]

Two things to consider in this PR:

* This introduces for the first time a configuration option through an environment variable (`OSM2PGSQL_WAY_NODE_INDEX_ID_SHIFT`) The idea is that this isn't something normal users will ever need, but a setting for specialists or developers who want to debug this. I would imagine that there will be other obscure settings like this in the future. Another way to handle this would be to add a command line option similar to the '-f' of compilers that allows setting these kinds of options without having more and command line options.
* This PR adds the functionality for the new index, but does't use it by default. If this is sucessful a later PR will change the default setting from "disabled" to a good default (probably around 5). This way we can introduce the change in master and give people the chance to test it easily without forcing anybody who runs master to think about it before they are ready.

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