additional list functionality (ala pandoc: fancy_lists)

[r2evans]

The fancy_lists extension in pandoc allows lists to use letters as
well as numbers (and roman numerals). Additionally lists can be
defined and/or continued using a "#" instead of numbers. This patch
modifies "markdown-insert-list-item" to include some checks for
numbers versus letters (no roman numerals yet) and the hash.
This also modified many of the regex consts for headers to account for
a following list item being a line starting with "#. " (which is
legal for pandoc even if not for all markdown renderers.

[r2evans]

I apologize for my elisp ... it's a bit rusty to say the least, and I know I'm ignoring a "better" way to do this: make its use optional via a customize variable.

I tested predominantly with Alt-enter, Ctrl-u Alt-enter, and Ctrl-u Ctrl-u Alt-enter (my primary reason for modifying the code), so if other testing should be necessary, please advise.

Thanks!

[kini]

You may wish to submit this to http://github.com/jrblevin/markdown-mode instead, since that's the official repo. This one is just a mirror.

[r2evans]

I didn't know about that, thanks. I was (blindly) trusting the annotation that this is mirrored from a non-github repo (on jblevins.org), for some reason believing that defunkt and jrblevin were the same. Funny. That explains the lack of discussion :-)

[kini]

Yeah, I went through a similar process. This repo is also the first google search result for "github markdown-mode", which is confusing as well...