Implement protocol handling.
* lisp/muse-mode.el (muse-mode): Call muse-update-url-regexp. Maybe I
should just make a hook for this stuff.
(muse-visit-link-default): Call muse-browse-url instead of browse-url.
* lisp/muse-protocols.el: New file that implements protocol handling.
* lisp/muse-publish.el (muse-publish-url-transforms): Add
muse-resolve-url.
(muse-publish-markup-url): Indentation fix, no func change.
* lisp/muse-regexps.el (muse-url-regexp): Move to muse-protocols.el.
* lisp/muse.el: Require muse-protocols.
git-archimport-id: mwolson@gnu.org--2005/muse--main--1.0--patch-219