[EM] Binary Clone Tree method (was reverse Llull)

[Forest Simmons]

This binary clone tree based method, like Reverse Llull, was designed with
perfect preference info in mind, but this method, unlike Reverse Llull, is
well adapted to zero info voting, as well.

Here is a near optimal zero info strategy: always vote for the branch that
contains your favorite among the remaining candidates; your natural
compromise candidates will be contained in this same branch.
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