Add coloring for example, verbatim, and =signs=; anchor fix.

Add coloring for example, verbatim, and =signs=; anchor fix.

* lisp/muse-colors.el (muse-verbatim-face): New face that is used to
  color <example>, <verbatim>, and =signs=.  Defaults to a shade of gray.
  (muse-colors-verbatim): Use `muse-verbatim-face'.
  (muse-colors-markup): Move =sign= interpreting down so it gets higher
  priority.
  (muse-colors-tags): Add verbatim and literal tags.
  (muse-colors-example-tag): Use `remove-text-properties' instead of
  `set-text-properties', since the latter does not work consistently.
  (muse-colors-literal-tag): New function that strips all markup from the
  region.
  (muse-colors-link): Match against muse-explicit-link-regexp early on so
  that we can work around an annoying XEmacs issue.

* lisp/muse-publish.el (muse-publish-markup-word): Make =signs=
  multi-line by default.

* lisp/muse.el (muse-page-name): Handle case where we're given an empty
  string.
git-archimport-id: mwolson@gnu.org--2005/muse--main--1.0--patch-167