'RevisionInsertComplete': called after a revision is inserted into the DB
$revision: the Revision
+'SanitizerAfterFixTagAttributes': called after the sanitizer normalises tag attributes.
+$text: The original text which had the tag attributes fixed in it.
+$element: The name of the element in which tag attributes are being fixed
+&$attribs: A reference to an array of the source for the attributes to be added,
+ in the form "$encAttribute=\"$encValue\""
+
'SavePreferences': called at the end of PreferencesForm::savePreferences;
returning false prevents the preferences from being saved.
$form: the PreferencesForm