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

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.