Changing back to Statistics.Distribution

- random-fu is not providing densities
- This package has its own issues, like requiring a 'quantile' function
	along with the density for every continuous distr
- This might be automate-able, using the 'findRoots' method provided
	by the library, as long as we have the cumulative distr
- Might write own distribution library, since all we need are densities
	at this point.