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Rewrite Multinomial as hand rolled iterated binomial.

Chris Jewell requested to merge github/fork/csuter/stochastic into stochastic

Created by: csuter

This brings the runtime for 195 days down to about 60sec. It's still really slow in XLA mode; not sure why. We can follow up with some performance analysis on our side.

I am reasonably confident that what I wrote is correct, but we should verify.

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