hide used domains from domain select, except for subdomain forms

interface/lib/classes/tools_sites.inc.php

interface/web/dns/dns_import.php

interface/web/dns/dns_slave_edit.php

interface/web/dns/dns_soa_edit.php

interface/web/dns/dns_wizard.php

interface/web/mail/mail_domain_edit.php

interface/web/sites/web_childdomain_edit.php

interface/web/sites/web_vhost_domain_edit.php