Issues with Utilities/Probability

I've been extending Utilities/Probability for a little bit with additional probability distribution sampler functions and have a couple of gripes:

• As far as I can tell Utilities/Probability is currently a normal distribution single-sampler and doesn't actually deal with larger concepts involving probability. This makes the module name appear to be a misnomer. I propose that it be renamed Utilities/Distributions, Utilities/Stats, or something similar.

• Further, the inclusion of the Distribution suffix in the module's functions is redundant. We already know that the module is about "Probability" and so exported function names should be obvious.

• BoxMuller is an implementation detail that should not be exposed to module consumers.

• Using single-sampler functions, functions that only sample one value from the distribution in question, does not allow us to abuse the strengths of accept-reject sampling methods to their fullest.

Review Utilities/Probability and its exported sampler functions to understand the current module scope, naming, and BoxMuller exposure. The work is complete when the module structure and public API are agreed on, including support for sampling multiple values rather than only single samples.