[Tile-serving] [openstreetmap/osm2pgsql] WORK IN PROGRESS: Add pole_of_inaccessibility() function in Lua for polygons (PR #1822)

[Jochen Topf]

> However, in the following example I was surprised about the location of `poi2`. I would have expected it somewhere in the right-top of `poi1` (blue)

If the polygon has several areas that are quite good it seems that it can take the algorithm a while to find the best one, it will be stuck on some local maximum somewhere and not consider that there is something better somewhere else. If you set the precision parameter smaller it should find the best position eventually but it will run much longer. You can try whether that makes a difference in this case.

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