[EM] simulator code for 2 Approval methods

[Brian Olson]

A BIG thank you to Raphfrk and Kevin Venzke! I've integrated the code  
they posted and I'm running the simulations currently, results to be  
posted in 1-3 days of compute time...

Here's a first one to whet your appetite, "ApprovalNoInfo" with three  
candidates showing a perhaps odd consequence of how the threshold  
gets set.

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