A working version?

Includes MaxEnt, logseries, Poisson lognormal, negative binomial, geometric series, and the generalized Yule, plus skips the generalized Yule if it fails to converge, but calculates AICc weights for the rest of the sites.  Can be easily changed to skip the site with the failure to converge altogether; I got that working first, and then tried the thing that was harder.