Simpler parallel debugging
Initially, once #128 is implemented, it should be extended to work from parallel MPI code. It would stop all MPI ranks at the call embed()
line, and attach to the first image in the command line. Then it would allow to use magics like %%image_attach 3
to attach to image number 3.
That would allow to easily Debug a parallel code.
Later, once #135 is implemented, one can extend that to handle parallel code also in a similar fashion.