Fix nested list regression. Make some (untested) progress on dl.

Fix nested list regression.  Make some (untested) progress on dl.

* lisp/muse-docbook.el (muse-docbook-markup-strings): Drop newline from
  end-ddt string.

* lisp/muse-html.el (muse-html-markup-strings): Ditto.

* lisp/muse-texinfo.el (muse-texinfo-markup-strings): Ditto.

* lisp/muse-xml.el (muse-xml-markup-strings): Ditto.

* muse.texi (Introduction): Fix dated part concerning muse-wiki.

* lisp/muse-publish.el (muse-publish-surround-dl): Make good progress on
  this.
  (muse-list-item-type): Deal with null str by returning nil.  It should
  never have to do this, but I'd rather not be bothered when I'm
  debugging something else.
  (muse-forward-paragraph): Make the enclosing parens shy.
  (muse-forward-list-item): Take optional ENTRY-P argument so that we can
  use this for both dl terms and dl entries.  Use muse-dl-entry-regexp
  when dealing with dl entries.  Lower the match number to cope with
  change to muse-forward-paragraph.
  (muse-publish-markup-list): Quote arguments lambda functions properly,
  so that we don't run into namespace conflicts.  This should fix a
  regression in nested list handling.

* lisp/muse-regexps.el (muse-list-item-regexp): Clarify docstring.
  (muse-dl-entry-regexp): New regexp that matches the beginning of a
  definition list entry.
git-archimport-id: mwolson@gnu.org--2005/muse--main--1.0--patch-347