$tokenFunctions array and return true (returning false makes no sense)
$tokenFunctions: array(action => callback)
-'APIQueryRecentChangesTokens': use this hook to add custom tokens to prop=revisions.
+'APIQueryRecentChangesTokens': use this hook to add custom tokens to list=recentchanges.
Every token has an action, which will be used in the rctoken parameter
and in the output (actiontoken="..."), and a callback function which
should return the token, or false if the user isn't allowed to obtain