New version of IPython makes Jupyter output less nice

[itamarst]

Previously the output of Fil for Jupyter reported code using pseudo-filenames like <ipython-cell-3>, which made it easy to map to the corresponding cell. With newest IPython, it's now reporting temporary file names instead, e.g. /tmp/ipython-123w4234/34232.py, which is harder (or impossible) to match to the corresponding cell.