Really basic support for eldoc, buidling off the oinfo cache code written to
support function annotations for the ein company backend. In theory should also
work the other completion backends, but untested at the moment.
Please see the new variable `ein:completion-backend'. Use this variable to
configure which completion backend to use in ein. Currently we support
auto-complete, company-mode, and jedi using auto-complete.
Only six months late. Jupyter changed callback signature for
complete_request, breaking ein's autocomplete code. Missed this for so
long because I am lazy and almost exclusively used jedi for
autocompletion. Ugh.
* Change the call signature of completer callback, to
pass arguments to completer callback.
* Use expand option to suppress auto expansion when
used as dot-complete.
