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

[pnorman]

Invalidation of tiles for large relations could lead to all the tiles in the US being invalidated by a tag change on a US border relation. It would be desirable to be able to not invalidate the interior of large boundary relations.

cc @gravitystorm 

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/osm2pgsql/issues/38
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