[EM] Preliminary Range PAV results

[fsimmons at pcc.edu]

Kristofer,

How about including Range SAV ?

Assume that the range ballots are functions from the set of candidates into the
set [0, M], where M is the max possible rating.  Then ballot r contributes the
following quotient to the total score for subset S of the set of candidates K:

Sum over k in S of r(k)

   divided by

Sum over k in K of r(k) .