/**
* @param $section empty/null/false or a section number (0, 1, 2, T1, T2...)
+ * @param $text String: new text of the section
+ * @param $summary String: new section's subject, only if $section is 'new'
+ * @param $edittime String: revision timestamp or null to use the current revision
* @return string Complete article text, or null if error
*/
public function replaceSection( $section, $text, $summary = '', $edittime = null ) {