Function layDeleteLayout

Deletes the layout with the given ID from the database and the file system.

Package: Core\Backend
Copyright: four for business AG <www.4fb.de>
License: http://www.contenido.org/license/LIZENZ.txt
Author: Jan Lengowski
Author: Olaf Niemann
Located at includes/functions.lay.php

Parameters summary
`integer`	`$idlay`	the ID of the layout

Return value summary
`string`	an error code if the layout is still in use

Thrown exceptions summary
`cDbException`
`cException`
`cInvalidArgumentException`