creation of passwordless "system" users for logged actions.
* $wgMaxSquidPurgeTitles was removed.
* $wgAjaxWatch was removed. This is now enabled by default.
+* (T27397) WebP is enabled by default as an uploadable filetype
=== New features in 1.27 ===
* $wgDataCenterId and $wgDataCenterRoles where added, which will serve as