setting in the relevant section of $wgLBFactoryConf.
* User::newSystemUser() may be used to simplify the creation of passwordless
"system" users for logged actions from scripts and extensions.
+* Extensions can now return detailed error information via the API when
+ preventing user actions using 'getUserPermissionsErrors' and similar hooks
+ by using ApiMessage instances instead of strings for the $result value.
==== External libraries ====
* Removed "loaderScripts" option from ResourceLoaderFileModule class.
* Removed ORM-like wrapper added in 1.20.
* LinkCache::getGoodLinks and LinkCache::getBadLinks were removed (deprecated in 1.26).
+* WikiPage::doQuickEdit() was removed (deprecated since 1.21).
+* Removed SiteObject and SiteArray classes (deprecated in 1.21).
== Compatibility ==