This should reduce the number of duplicated documentation snippets and replace @inheritParams tags.

The docstrings for e.g. ftest are not present in the generated
documentation but are quite useful. I think the full API should be in
the generated docs.

Currently we can build a histogram by specifying the edges.
We can also specify a number of bins, and the edges are chosen automatically using the extrema.
It would be helpful to also have an option for specifying bin dimensions to be used uniformly, where the edges would again be chosen using the extrema.

the zerocorr* functions are documented (in constructors.jmd) but fulldummy isn't. Might be a good idea to have a separate "formula extensions" page to document all the special syntax that mixed models introduces.

I am fairly sure this is easy to do,
though it will maybe never be the default term,
You will be able to specify it via hints?

Might be good to do an example of AngualarTerm or CyclicalContinousTerm that represents an angle and is modelcol'd to sin(X),cos(x)

Bonus points if it can actually be made the default term type for Unitful angles