* rebuildFileCache.php no longer creates inappropriate cache files for redirects
* (bug 23119) WikiError class and subclasses are now marked as deprecated
* (bug 18372) $wgFileExtensions will now override $wgFileBlacklist
+* (bug 10871) Javascript and CSS pages in MediaWiki namespace are no longer treated
+ as wikitext on preview.
=== API changes in 1.17 ===
* (bug 22738) Allow filtering by action type on query=logevent.