Allow formatting/content options to be set in the model summary constructor

[cdiener]

Checklist

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Is your feature related to a problem? Please describe it.

Summaries look great in Jupyter notebooks by default, but changing output options is clunky as it happens only in the to_string and to_html methods. For instance, there is no easy way to change the summary element to something other than "C" in a notebook because model.summary().to_html(element="N", names=True) will not render nicely by default.

Describe the solution you would like.

I would like the constructor to accept optional keyword arguments for those methods, enabling things like: model.summary(element="N", names=True).

Describe alternatives you considered

Wrapping everything in HTML(...) calls but this makes object inspection clunky.

Additional context

I'd be happy to provide a PR if other agree with this design.

[Midnighter]

The original intent was that you can create different outputs from the same summary object. I would like to keep that behavior but the constructor arguments could certainly set the default if that's good enough for you?

[cdiener]

Oh sorry. Never meant to remove them from the to_* methods. Just want them settable in the constructor as well. So they would set the default as you said.