/**
* delete the customer selected
* @param $customerid
* @return Boolean
*/
public static function del($customerid)
{
// Delete all the domains
Domains::delete_by_customerid($customerid);
// Delete all the references of the customers
CustomersDomainsRegistrars::del($customerid);
// Delete all the orders
Orders::DeleteByCustomerID($customerid);
// Delete all the customer's files
Files::delete_all_by_customerId($customerid);
return Doctrine_Query::create()->delete('Customers')->where('customer_id = ?', $customerid)->execute();
}