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

[Paul Norman]

This would mean not combining adjacent tiles into a higher level zoom, right?

How does this differ from other Morton codes, Z-order, and quadkeys? I'm specifically interested in quadkeys, since they're already used for serving maps.

See also 
* http://wiki.openstreetmap.org/wiki/QuadTiles
* https://msdn.microsoft.com/en-us/library/bb259689.aspx


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