Should r/d/q/pcontbern be exported?

[wleoncio]

I wonder if we should export those functions, since they are not available on base-R and mightbe useful for users.

If we do that, it would be nice to give those functions the ability to process lower.tail and log.p, which are common arguments among other distros.

[wleoncio]

On the other hand, functions from the popular rmutil packages (also used here) like invgauss() and multbinom() do not contain a lower.tail argument. They do contain a log argument for the density variant, though, so we could also follow that paradigm to make our lives easier (or at least for an initial deployment/solution to this issue).