comments, or bug reports: thanks to all of you!
Significant bug fixes were provided by Cécile Ané, James Bullard,
-Éric Durand, Olivier François, Rich FitzJohn Bret Larget, Nick Matzke,
+Éric Durand, Olivier François, Rich FitzJohn, Bret Larget, Nick Matzke,
Elizabeth Purdom, Dan Rabosky, Klaus Schliep, Tim Wallstrom, Li-San
Wang, Yan Wong, and Peter Wragg. Contact me if I forgot someone.