Make all XML-based publishing styles do tables. Needs testing.

Make all XML-based publishing styles do tables.  Needs testing.

* lisp/muse-docbook.el (muse-docbook-markup-functions): Use
  muse-xml-markup-table.
  (muse-docbook-markup-regexps): Remove table kludges.
  (muse-docbook-markup-strings): Add markup strings for tables.
  (muse-docbook-encoding-map, muse-docbook-transform-content-type)
  (muse-docbook-markup-table): Remove in favor of using the functions in
  muse-xml-common.el.
  (muse-docbook-encoding): Use muse-xml-transform-content-type.
  (muse-docbook-markup-paragraph, muse-docbook-insert-anchor): Use
  muse-insert-markup.
  (muse-docbook-fixup-tables): Remove, since it isn't needed anymore.
  (muse-docbook-prepare-buffer): New function that forces the escaping of
  extra specials in URLs.

* lisp/muse-html.el (muse-html-table-attributes): Add a leading space.
  Fix documentation.
  (muse-html-markup-regexps): Remove table kludges.
  (muse-html-markup-strings): Add markup strings for tables.
  (muse-html-encoding-map, muse-html-transform-content-type): Remove in
  favor of the functions of muse-xml-common.el.
  (muse-html-insert-anchor, muse-html-markup-paragraph)
  (muse-html-class-tag): Use muse-insert-markup.
  (muse-html-markup-table): Call muse-xml-markup-table to do most of the
  work, passing attributes.
  (muse-html-insert-contents): Use muse-insert-markup.  Bum it down a
  bit.
  (muse-html-encoding): Use muse-xml-transform-content-type.
  (muse-html-fixup-tables): Remove.

* lisp/muse-xml-common.el: Move a few functions and options here from
  other publishing styles.  Make an initial attempt at an XML-based table
  publishing routine that uses markup strings.  I'm not sure if it will
  abstract easily enough to use with LaTeX, but that's not a huge
  concern.

* lisp/muse-xml.el (muse-xml-markup-regexps): Remove table kludges.
  (muse-xml-markup-strings): Add table markup strings.  Omit table-group
  markup since it's unnecessary sugar.
  (muse-xml-encoding-map, muse-xml-transform-content-type)
  (muse-xml-markup-table): Move to muse-xml-common.el.
  (muse-xml-encoding): Pass default argument.
  (muse-xml-markup-paragraph, muse-xml-insert-anchor): Use
  muse-insert-markup.
  (muse-xml-fixup-tables): Remove.
git-archimport-id: mwolson@gnu.org--2005/muse--main--1.0--patch-315