tab-completion in the Ipython shell invoked with `c s s`

[sstyer]

I think this would be a nice feature to get tab-completion, and I can't imagine this being too difficult since the default run-python command in emacs has tab-completion.

If someone knows better than I, please comment.

(How do I mark this as an enhancement?)

[fgallina]

I'll tackle this next and ensure it's a bit more robust after docs and cleaning up the current callback mechanism for quick management commands.