remove the groups specified in $wgAddGroups and $wgRemoveGroups for
any groups they are in.
* New permission userrights-interwiki for changing user rights on foreign wikis.
-* $wgImplictGroups for groups that are hidden from Special:Listusers, etc.
+* $wgImplicitGroups for groups that are hidden from Special:Listusers, etc.
* $wgAutopromote: automatically promote users who match specified criteria
* $wgGroupsAddToSelf, $wgGroupsRemoveFromSelf: allow users to add or remove
themselves from specified groups via Special:Userrights.