Add alternative parametrization for beta distribution #94
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Extends the Beta distribution to be parametrized in terms of mu and sigma (standard deviation) or mu and kappa (concentration).
This also works as a reference for future alternative parametrization of other distributions. The approach is to use one parametrization for all internals and just have a few functions to convert from that parametrization to the others. The conversion is to keep all parameters values updated (even those not directly set by the user) and to report (plots and string repr) the parameters using the user's choice.