* Added 'HistoryRevisionTools' and 'DiffRevisionTools' hooks.
* (bug 33186) Add image rotation api "imagerotate"
* (bug 34040) Add "User rights management" link on user page toolbox.
+* (bug 45526) Add QUnit assertion helper "QUnit.assert.htmlEqual" for asserting
+ structual equality of HTML (ignoring insignificant differences like
+ quotmarks, order and whitespace in the attribute list).
=== Bug fixes in 1.21 ===
* (bug 40353) SpecialDoubleRedirect should support interwiki redirects.