Add codespell

[jpthiele]

This adds support for codespell,
which is a spellchecker based on a dictionary of common typos.

The first commit adds a .codespellrc configuration file,
which makes codespell ignore two common typos:

• rcall for recall
• missings for missing
  as both are Julia package names we use throughout pdelib.

The second commit amends the legitimate typos codespell has found.

[jpthiele]

Codespell can be installed through conda-forge or pip and can be run in the main repo folder with
codespell . if you want to see how it flagged the errors
With codespell -w . the fixes can be applied directly if all are clear.

[jpthiele]

In the future we could add our own dictionary as well if needed.
E.g. for typos like Voroni or Makei but we can do that whenever such a typo comes up.

[jpthiele]

@j-fu @chmerdon I'm happy to add such a PR to each of your repos if you want.

[pjaap]

Thanks for setting this up. I would go one further and activate this for CI. Can you add this as a third commit?

[chmerdon]

@jpthiele Please do, thx

[jpthiele]

Thanks for setting this up. I would go one further and activate this for CI. Can you add this as a third commit?

My current plan is to add a follow-up PR with a .pre-commit-config.yml with both Runic.jl and codespell, as well as a few other small useful hooks, each as individual commits so we can pick and choose. It will also have a pre-commit CI file

[pjaap]

Ok, then this is now basically a spell fix PR, so I would merge this.