Anchor fixes; muse-latex: Use \label{} and \ref{} for anchors.

Anchor fixes; muse-latex: Use \label{} and \ref{} for anchors.

* experimental/muse-xml.el (muse-xml-insert-anchor)
  (muse-xml-markup-anchor): Make sure we don't blow away the text just
  before an anchor.  On all types but texinfo, insert a newline
  immediately after the anchor.

* lisp/muse-docbook.el (muse-docbook-insert-anchor)
  (muse-docbook-markup-anchor): Ditto.

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

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

* lisp/muse-publish.el (muse-publish-markup-regexps): Make text before
  the anchor the first match group.

* lisp/muse-latex.el (muse-latex-markup-strings): Use \ref{} for
  internal-link rather than \hyperlink{}.  Thanks to Jim Ottaway for the
  suggestion.
  (muse-latex-insert-anchor): Use a simpler routine that inserts
  \label{}.
git-archimport-id: mwolson@gnu.org--2005/muse--main--1.0--patch-253