DB queue was changed to support better concurrency and reduce deadlock errors.
* Added ApiQueryORM class to facilitate creation of query API modules based on
tables that have a corresponding ORMTable class.
+* (bug 40876) Icon for PSD (Adobe Photoshop) file types.
=== Bug fixes in 1.21 ===
* (bug 40353) SpecialDoubleRedirect should support interwiki redirects.