1. Previously, the code had references to ein:notebook-mode which doesn't seem
to work (anymore), so I changed these references to ein:notebook.
2. The previous code had a big convoluted function that produced the
doc-string and that was difficult to read that depended on some other
smaller functions, though not enough of them to make the code
sufficiently modular, and therefore, it wasn't very maintainable.
Besides, when I tried the previous version with the name of the mode fixed,
spacemacs hung for a long time -- it's a mystery whether spacemacs would
have continued normally if I had waited long enough. Therefore I replaced
the doc-string with a hard coded one.
3. I added some keybindings from tkamat's fork to the code for I didn't see
a good reason not to
4. I removed the cl- prefix from "second" and "mapcan", because cl is a
deprecated package. However, I'm afraid the names without the prefix might
end up being unrecognized by previous versions of emacs.
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