[Tile-serving] [openstreetmap/osm2pgsql] Invalidation for large relations (#38)

[Paul Norman]

A misdirected email from @woodpeck from 2013 said

> Normally, expire_tiles_from_poly will expire tiles for the whole bounding box of the polygon unless the bbox has a width or height higher than EXPIRE_TILES_MAX_BBOX, in which case only those tiles actually touched by the outline of the polygon will be expired.

> This should make sure that the whole of the US is never invalidated.

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