* README.org: Add notes on behavior when a kernel's language name has spaces
and uppercase characters.
* jupyter-base.el (jupyter-canonicalize-language-string): New function.
* jupyter-client.el (jupyter-kernel-info): Use it.
* jupyter-kernelspec.el (jupyter-available-kernelspecs): Use it.
* ob-jupyter.el (org-babel-jupyter-aliases-from-kernelspecs): Use it.
* test/jupyter-test.el (jupyter-canonicalize-language-string): New test.
* README.org: Add section on `jupyter-eval-use-overlays`, minor formatting fix
* jupyter-client.el (jupyter-eval-overlay): New face.
(jupyter-eval-use-overlays, jupyter-eval-overlay-prefix): New custom variables.
(jupyter--display-eval-result): Remove function.
(jupyter-eval): Use `jupyter-eval-string`.
(jupyter-eval-result-callbacks): New function.
(jupyter-eval-add-callbacks): Result callbacks now obtained from
`jupyter-eval-result-callbacks`, only add callbacks for non-result message
types. Allow `beg` and `end` arguments remove `result-cb` argument, update all
callers.
(jupyter-eval-string): Allow `beg` and `end` arguments remove `cb` argument,
update all callers.
(jupyter-eval-string-command): Remove `cb` argument, update all callers.
(jupyter-eval-region): Ditto.
(jupyter-eval-line-or-region): Refactor.
(jupyter-eval-overlay-keymap): New keymap.
(jupyter-eval-ov--delete, jupyter-eval-ov--remove-all)
(jupyter-eval-ov--propertize, jupyter-eval-ov--fold-boundary)
(jupyter-eval-ov--expand-string, jupyter-eval-ov--make)
(jupyter-eval-ov--expand, jupyter-eval-ov--fold)
(jupyter-eval-toggle-overlay, jupyter-eval-remove-overlays)
(jupyter-eval-display-overlay, jupyter-eval-display-with-overlay-p): New
functions.
* jupyter-repl.el (jupyter-eval-string): Ensure callbacks are added in the
original (non-REPL) buffer the command was called from. So that
`jupyter-eval-display-with-overlay-p`, indirectly called by
`jupyter-eval-add-callbacks`, works.
(jupyter-repl-interaction-mode-map): Set `C-c C-o` binding to
`jupyter-eval-remove-overlays`.
If method arguments are not named it gives rise to errors like
`Args out of range: "", 0`
that originate in `help-function-arglist` when calling `describe-function` on
those methods.
A BEGIN_SRC block can specify which mime type to display by enabling the
user to manually set the priority order of mime types.
e.g.: In the following, :text/plain will be used before considering :text/html
#+BEGIN_SRC jupyter-python :display plain html
