Return full stack trace if code chunk raises exception

[hancush]

We're using pweave as part of our Python data processing pipeline, and it's great!

Early data work and charting can be fiddly, though, and it would be helpful if we could see the full stack trace if a code chunk raises an exception. Is this currently possible through a chunk option or flag (we're using the CLI to weave an .mdw file to .tex)? If not, you would consider implementing? (Happy to discuss and help if I can.)

Thank you!

[mpastell]

Are you using 0.25? Current master gives improved tracebacks, thanks to using jupyter_client