Fix #20: long times break with Substack's Gamma #21
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For quizzes much longer than a model halflife, Substack's Gamma can return NaNs during
_updateRecallSingle馃槶(Note this doesn't happen with stdlib's more accurate Gamma function 馃挭!)
This PR fixes this by switching to the log domain if the default linear-domain calculation fails to converge. For the examples in #20, as well as much more extreme examples (per the new unit test, when the quiz is 1e5 times the halflife!), this is sufficient for the update step to converge.
New minor release version is included but needs to be rebuilt before release.