Clean up main.

And remove unused import.
Use triple double-quotes for docstrings.
Fix some docstrings and cli help message.
Remove numpy comparison version.
Docstring for do_julia_runs.
Move numpy computation to top.
Rewrap some lines.
Rename main function to cli.
Add docstring for `do_julia_run`.
Rewrap some lines.
Add a missing parameter to a docstring.
Remove comments from main...

now that we have docstrings.
Add a docstring for cli.
Simplify code, correct docstrings, wrap lines.