[EM] Best Copeland Version ..

[Forest Simmons]

A small change to make the method more symmetrical while making ties less
likely:

Elect the alternative X with the greatest value of the difference D(X)
given by

diameter[BBOT(X)] - diameter[DOT(X)],

where the first bracketed set is the set of alteratives beaten by or tied
with X, and the other one, those defeating or tying  X (pairwise in both
cases).

This "Copeland score" should be a good one for making a social order with
nice properties.
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