$page: ImagePage object
&$toc: Array of <li> strings
-'ImgAuthBeforeStream': executed before file is streamed to user, but only when
+'ImgAuthBeforeStream': Executed before file is streamed to user, but only when
using img_auth.php.
&$title: the Title object of the file as it would appear for the upload page
&$path: the original file and path name when img_auth was invoked by the web
$result[2 through n]=Parameters passed to body text message. Please note the
header message cannot receive/use parameters.
+'ImgAuthModifyHeaders': Executed just before a file is streamed to a user via
+img_auth.php, allowing headers to be modified beforehand.
+$title: LinkTarget object
+&$headers: HTTP headers ( name => value, names are case insensitive ).
+ Two headers get special handling: If-Modified-Since (value must be
+ a valid HTTP date) and Range (must be of the form "bytes=(\d*-\d*)")
+ will be honored when streaming the file.
+
'ImportHandleLogItemXMLTag': When parsing a XML tag in a log item.
Return false to stop further processing of the tag
$reader: XMLReader object