$modeName: the requested content model name
&$handler: set this to a ContentHandler object, if desired.
+'ConvertContent': Called by AbstractContent::convert when a conversion to another
+content model is requested.
+$content: The Content object to be converted.
+$toModel: The ID of the content model to convert to.
+$lossy: boolean indicating whether lossy conversion is allowed.
+&$result: Output parameter, in case the handler function wants to provide a
+converted Content object. Note that $result->getContentModel() must return $toModel.
+Handler functions that modify $result should generally return false to further
+attempts at conversion.
+
'ContribsPager::getQueryInfo': Before the contributions query is about to run
&$pager: Pager object for contributions
&$queryInfo: The query for the contribs Pager