One more issue relating to 0.6->0.7. One of my notebooks loads in a local data file, which lives in the same path as the notebooks, eg

content/chapter3/section.ipynb
content/chapter3/file.dat

The executor now fails when run from the top-level directory because it can't find the file in the local path. (FileNotFoundError)

I'd prefer to not hard-code the path into the notebook, and expect that the working directory should change to reflect the path of the notebook during execution.