+* BREAKING CHANGE: Skins built for MediaWiki 1.15 and earlier that do not use
+ the "headelement" template key are no longer supported. Setting
+ $useHeadElement = false; is no longer supported and will not cause old keys
+ like "headlinks", "skinnameclass", etc. to be defined.
+* The deprecated 'SpecialVersionExtensionTypes' hook was removed.
+* (bug 63891) Add 'X-Robots-Tag: noindex' header in action=render pages.