[Gllug] Median cut algorithm

[Nix]

On 14 Mar 2008, Tethys stated:
> But whether anyone has a use for it or not, what's the downside
> in doing it anyway? It shouldn't be too much work, and I can 100%
> guarantee you that *someone* will want to use it at some point.

I'm using it at work to reduce the size of munin-generated graphs sent
by email (but I could use pngcrush: I just forgot it existed).

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