[Tile-serving] [osm2pgsql] Bad multipolygon tags (#80)

[Paul Norman]

> [relation 936128](http://www.openstreetmap.org/browse/relation/936128) (admin boundary for Poland)

This isn't the admin boundary for poland, [relation 49715](http://www.openstreetmap.org/browse/relation/49715) is.

I'd call this a tagging error myself. @apmon's suggestion of

> Nevertheless, the algorithm can probably be improved by only copying tags from outer ways that are present on all outer ways, rather than tags that are present on at least one outer way

is probably the best approach to it, but this is actually a difference that may catch some people up, particularly for large multipolygons where they do not have all member ways downloaded. I'm thinking of some of the past issues with the large lakes in Australia and Canada and people asking on the local lists for help.

We're probably best dealing with this post-0.84

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