Prime probability *decreases* when slprp_test and eslprp_test are enabled #20

Currently, buffer.rs lines 92-102 decrease the probability that a number is prime once it passes the slprp or eslprp test. I suspect you intended to decrease the probability that the number wasn't prime. Assuming the probability of accepting a pseudoprime, conditioned on having passed the Miller-Rabin tests, was meant to be 4/15, this would be done with

probability = 1. - ((1. - probability) * 11f32 / 15f32);

I'm also concerned that the probability estimate may be incompatible with Bayes' Theorem, because it doesn't take into account that by the Prime Number Theorem, the prior probability of a number's primality decreases as the number grows larger. I may be slightly biased in the same direction as the Yudkowsky crowd, but it seems to me that applying Bayesian statistics is obligatory when formally-proven priors are available.