[Tile-serving] [openstreetmap/osm2pgsql] Rewrite tile expiry (management of expired tiles) (#709)

[Michael Reichert]

@giggls wrote me that the German tile server uses following:

```bash
MINZOOM=13
osm2pgsql ... -e $(($MINZOOM-3))-16 -o $EXPIRELOG
..
expiremeta.pl --map=mapnikde --minzoom=$MINZOOM <$EXPIRELOG
```

[expiremeta.pl](https://github.com/openstreetmap/tirex/blob/master/utils/expiremeta.pl) is part of tirex.

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