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

[Paul Norman]

> Calculating the PIA is expensive enough that I am sceptical about doing this many times for different aspect rations and/or rotations, so I don't think that's a good approach. I am certain there are better algorithms, but its unlikely we'll come up with something quickly. The main question for me is: Is the PIA we have here (with the scaling modification) a good enough solution for now that it makes sense baking it into osm2pgsql?

Yes. I'm not sure the scaling modification gains anything, but it's already coded.

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