[EM] High precision Yee diagrams

[Raph Frank]

I implemented one that can handle PR methods, but that didn't use randomness.

It also uses java to let the user move the voter centre around.  Two
circles are use.  The inner one contains 50% of the voters (if I
remember correctly).

http://raphfrk.com/ping_yee/results.html

Under the system, if asked for 100 voters, it would create a 10x10
rectangular grid of voters and then transform them using a rectangular
grid to guassian mapping function.