Add condocert method to score guacs

[FrancescaV]

• re-write Jenna's code
• test script on Jenna's ballot. Do we recover it?
• add logic for a tie. For now we pick a winner at random among the subset (how often does that occur over 200 simulations??)

[gambingo]

Sounds like a tie isn't an issue, so I'll close this. But we can re-open it if we need!