Use this to extend core API modules.
&$module: Module object
+'APICheckCanExecute': Called during ApiMain::checkCanExecute. Use to
+further authenticate and authorize API clients before executing the
+module. Return false and set a message to cancel the request.
+$module: Module object
+$user: Current user
+&$message: API usage message to die with
+
'APIEditBeforeSave': before saving a page with api.php?action=edit,
after processing request parameters. Return false to let the request
fail, returning an error message or an <edit result="Failure"> tag