Dealing with different parametrizations

There are several distributions which have more than one common parameterisation. This can also differ between PPL or interface. At the least we need to be explicit which we are referring to in both the models and priors. But perhaps there is also a way to present multiple relevant parameterisations

No files, tests, or entry points are identified in the issue. Start by reviewing how models and priors are represented, then clarify which distributions need parameterisation metadata and how multiple relevant parameterisations should be presented; done means the chosen conventions are explicit for both models and priors.

Written by the indexing model from the issue text.