allow beta distribution to have user specified loc/scale

This does what it says on the tin. It allows the user to specify the min/max of the beta distribution. This just completes the implementation of the underlying scipy object.

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• 17699355 - Update docstring

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I think if we're going to use maximum and minimum here rather than getting the user to input a loc and scale value, then the doc string should make it clear how they are related. So, it should say that for a given maximum and minimum this is equivalent to scaling the standardized beta distribution by maximum-minimum, with it starting a minimum.