[Tile-serving] [openstreetmap/osm2pgsql] Use zigzag encoding for way node lists (#1491)

[Jochen Topf]

The delta encoded ids are, of course, sometimes positive, sometimes
negative. The zigzag encoding makes sure this is efficiently encoded.
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/osm2pgsql/pull/1491

-- Commit Summary --

  * Use zigzag encoding for way node lists

-- File Changes --

    M src/middle-ram.cpp (6)

-- Patch Links --

https://github.com/openstreetmap/osm2pgsql/pull/1491.patch
https://github.com/openstreetmap/osm2pgsql/pull/1491.diff

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