[IPython-dev] Storing signatures outside the notebook

[MinRK]

I've implemented a version of the db ​option in #7244
<https://github.com/ipython/ipython/pull/7244>. Each approach has
advantages and disadvantages, but I don't relish having to chase notebook
files around with more things associated by filename. We do already do that
with checkpoints, though, so this could easily be done in the same way.

I do think we should do this for 3.0, if we decide we want to do it at all,
since we are doing an nbformat revision already.

-MinRK
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