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 ====