[EM] Schulze STV and beyond

[Greg Nisbet]

http://en.wikipedia.org/wiki/Schulze_STV

definition:
minimal pair-- borrowing the term from linguistics, in this context it
means two sets of candidates that differ only by one member. E.g. [X,Y,Z] vs
[X,Y,A]

test candidate-- the candidate that is different in each element of the
minimal pair. E.g. Z and A in the above example.

>From what I can gather Schulze STV can be generalized into two procedures

1) some method of determining which element of a minimal pair is better

2) a beatpath method for comparing non-minimal pairs.

Under Schulze STV the first procedure consists of the following:

Comparing add up how many people uniquely prefer each combination of
elemtents of the set to the test candidate of the other set. Call this value
the strength of that set. Whichever set is stronger wins.

This could conceivably be replaced with a cardinal method.
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