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There's now a rudimentary :histogram-diff command. It takes two histograms
and a maximum difference (between 0 and 1) and evaluates to true if the
histograms are no further apart than that. There's a :histogram (for literal
histogram strings) and :histogram-at (take x, y, width, and height,
generating the histogram from on-screen pixels.)
I'm not 100% done, but pushing to work on another computer.
Accepting this closes #32.