Upload Matlab code for journal paper to Zenodo

[stiber]

The final version of all Matlab code from the repo. No need to wait to bundle it into the release. Do this after completing issue #215

[stiber]

We'll do this by the end of spring, even though the journal paper (not necessarily for Chaos) is delayed.

[stiber]

Moved back into backlog as we re-target paper and clean up repo