[Tile-serving] [openstreetmap/osm2pgsql] Optionally wrap polygon geometries in multipolygons (#1327)

[Jochen Topf]

I have restructured the code to better match intentions and added tests. Also added a new commit that switches the default for the multi setting from false to true as outlined in #1316. The config option is now called `split_at` to better match the somewhat similar option for lines, although the only allowed value is `multi`.

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