API for EspressoDB

[ckoerber]

I believe this is a pretty long-term idea.

It would be neat if we could wrap this into EspressoDB to also have an extensive save and load interface and potentially share fits across machines.

With Django-gvar in mind, a lot of this should already be present. The key difficulty will likely be associated with having a "perfect snapshot" of the fit function (as they likely will not always be part of a version controlled infrastructure).

I wonder if following up on the latex/sympy route is the right way to go (i.e., users don't code fit function but rather provide texed expressions). But this, as well, sounds as almost an entirely new project.

[ckoerber]

https://django-plotly-dash.readthedocs.io/en/latest/index.html seems helpful as well.