Allow notebook authors to control cell skipping/mocking other than by comments in code?

[ceball]

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[timkpaine]

e.g. config file

[ceball]

Makes some sense to merge issues, I'll just record that the closed issue was about lint rather than tests, and included this note:

This could be done by any or all of cell tags, cell metadata, notebook metadata.

And when running nbcelltests.lint, you should be able to define how notebook authors can disable checks (if at all).

E.g. it should be possible to override notebook-local lint rules if you want. A notebook author might override some stupid global lint rule locally in their notebook. That's fine. But maybe sometimes you run over a set of notebooks and you want to prevent certain local rules from applying because they are somehow very important to you.