Rename libxml2 functions, and make parse tree format consistent with xml.el.
* xml.c: Switch to GNU indentation. (make_dom): Change parse tree format to match xml.el. (Fxml_parse_html_string_internal): Rename from html-parse-string. (Fxml_parse_string_internal): Rename from xml-parse-string. * configure.in: Announce whether libxml2 is linked to.
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