func DelUser(name string) (err error) {
	err = del(name, &User{})
	if err == nil {
		err = del(name, &Shadow{})
	}
	return
}
func DelUser(name string) (err error) {
	err = del(name, &User{})
	if err == nil {
		err = del(name, &Shadow{})
	}
	return
}
// DelUser removes an user from the system.