+'MaintenanceUpdateAddParams': allow extensions to add params to the update.php
+maintenance script.
+&$params: array to populate with the params to be added. Array elements are keyed by
+the param name. Each param is an associative array that must include the following keys:
+ - desc The description of the param to show on --help
+ - require Is the param required? Defaults to false if not set.
+ - withArg Is an argument required with this option? Defaults to false if not set.
+ - shortName Character to use as short name, or false if none. Defaults to false if not set.
+ - multiOccurrence Can this option be passed multiple times? Defaults to false if not set.
+