Make publishing DTRT when using escaped list markup.
* lisp/muse-publish.el (muse-publish-surround-text)
(muse-publish-markup-list): Ignore escaped list markup.
* lisp/muse.el (muse-list-item-type): Docfix.
(muse-list-item-critical-point): New function that returns the point
where we should expect to find the first character in the current list
item markup.
(muse-forward-paragraph): Docfix and cosmetic change.
(muse-forward-list-item): Ignore escaped list markup. This should fix
a few publishing errors that involve markup like =::=.
git-archimport-id: mwolson@gnu.org--2006/muse--main--1.0--patch-115