Updated notes on Bayesian estimates of Fst

I included a few details about the Bayesian model that Hickory uses that weren’t in the notes I posted earlier – the among population allele frequency distribution and extending the model to includ locus- and population-specific effects. I’ve edited the notes to include those details, and you’ll find new HTML and PDF versions on the website. They’ll appear in the consolidated “book” version of the notes in mid-late December.