Feature "request": Jupyter debug output

[joachimneu]

Looking at the bug tracker, many issues seem to involve the interaction with Jupyter. Depending on installation, the relevant Jupyter might be system-wide, or burried in some Python virtualenv/Conda. It seems not always easy to locate it and invoke it such that it respects its environment. This could be overcome with an optional binary parameter debug to notebook() which, if set, invokes Jupyter with --debug and forwards all its stdout and stderr to Julia's stdout (currently, the output is lost due to wait=false).

Did I miss anything? Any objections?

[stevengj]

That's reasonable.