[Tile-serving] [osm2pgsql] Export change list with single index format (#461)

[Yuri Astrakhan]

Thanks for the links!  I will have to read up on quadtiles/quadkeys.  As for combining, upon further thinking, I don't think its worth the time - its much easier to simply convert (x,y) into a single index, sort by that index, and combine sequential indexes into ranges, thus greatly simplifying tile regeneration. Also, the list should generate just one, high zoom level - because the importer will be able to automatically convert it to the lower zooms as needed.

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https://github.com/openstreetmap/osm2pgsql/issues/461#issuecomment-148878949
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