Serialization.
* closure-html.asd: Added unparse.lisp
* src/defpack.lisp (CLOSURE-HTML): Use runes and sgml; export
make-octet-vector-sink, make-octet-steam-sink, make-rod-sink,
make-character-stream-sink, make-string-sink/utf8,
make-character-stream-sink/utf8, make-string-sink,
with-html-output, with-output-sink, with-element, attribute, text,
comment;
re-export pt, pt-name, pt-children, pt-parent, pt-attrs.
* src/parse/lhtml.lisp (walk-lhtml, lhtml->pt, lhtml-reader,
dispatch-macro-character #\# #\T): moved here from pt.lisp.
* src/parse/pt.lisp (walk-lhtml, lhtml->pt, lhtml-reader,
dispatch-macro-character #\# #\T): moved away.
* src/parse/unparse.lisp: New.