Make visiting of links a bit faster.
* lisp/muse-colors.el (muse-unhighlight-region): Remove muse-link
property.
(muse-link-properties): If we are highlighting a link, add the
muse-link property.
* lisp/muse-mode.el (muse-link-at-point): If the muse-link property
exists at point, use it to bound the link. Otherwise, use the old
method. This should make it easier to visit custom implicit link
forms, since it does not require a change to muse-implicit-link-regexp.
* lisp/muse-regexps.el (muse-implicit-link-regexp): Note that this is not
used when muse-colors.el is loaded.
git-archimport-id: mwolson@gnu.org--2006/muse--main--1.0--patch-51