Revisit AEC/BAC notebooks after ARC update, and possibly add notebooks to CI?

[jonwzheng]

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As per #694, we should double-check the AEC/BAC notebooks. As of writing, we are unable to do this because ARC is required but ARC is currently not compatible with Python 3.7.

Once ARC is updated, we should just go ahead and make sure those notebooks we're supplying are still good.

We may want to add some of the notebooks to the CI suite to automatically catch any errors in the future.