[Tile-serving] [openstreetmap/osm2pgsql] force some relations to planet_osm_polygon (#792)

[Eoghan Murray]

I've encountered a situation where both a doubled border, and a gap in a linestring have caused relations tagged with type=boundary to end up in planet_osm_line instead of planet_osm_polygon.  Is there (or should there be) a way of specifying that certain tags should be forced to polygons no matter what? I don't know how the existing conversion works, but I'm thinking of some sort of 'best case' conversion using http://postgis.net/docs/ST_ConcaveHull.html
To me this would seem like sensible default behaviour given the maxim 'be liberal in what you accept'.
Thanks for a great tool!

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