Merge muse-xhtml.el into muse-html.el.

Merge muse-xhtml.el into muse-html.el.

2005-04-06  Michael Olson  <mwolson@gnu.org>

    * examples/mwolson/muse-init.el: Update with respect to the
    muse-xhtml.el merge.

    * muse-html.el: The contents of muse-xhtml.el have been merged in
    as advised by John Wiegley.
    (muse-html-style-sheet): Add example for XHTML use in the
    function's documentation.
    (muse-xhtml-header, muse-xhtml-footer, muse-xhtml-markup-tags):
    Moved from muse-xhtml.el.

    * muse-xhtml.el: Removed; contents merged into muse-html.el.
git-archimport-id: mwolson@gnu.org--2005/muse--main--1.0--patch-24