'SpecialSearchResults': Called before search result display
$term: string of search term
-&$titleMatches: empty or SearchResultSet object
-&$textMatches: empty or SearchResultSet object
+&$titleMatches: empty or ISearchResultSet object
+&$textMatches: empty or ISearchResultSet object
'SpecialSearchResultsPrepend': Called immediately before returning HTML
on the search results page. Useful for including an external search