-- All of the code now uses the AFCalc object, not the not package protected AFCalcResultTracker. Nearly all unit tests pass (expect for a contract failing one that will be dealt with in subsequent commit), due to -Infinity values from normalizeLog10.
-- Changed the way that UnifiedGenotyper decides if the best model is non-ref. Previously looked at the MAP AC, but the MAP AC values are no longer provided by AFCalcResult. This is on purpose, because the MAP isn't a meaningful quantity for the exact model (i.e., everything is going to go to MLE AC in some upcoming commit). If you want to understand why come talk to me. Now uses the isPolymorphic function and the EMIT confidence, so that if pNonRef > EMIT then the site is poly, otherwise it's mono.
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