NEW Add type "url" as possible extrafield.

htdocs/admin/supplier_order.php

htdocs/comm/propal/card.php

htdocs/commande/card.php

htdocs/compta/facture/apercu.php

htdocs/compta/facture/prelevement.php

htdocs/core/class/extrafields.class.php

htdocs/core/class/html.form.class.php

htdocs/core/tpl/admin_extrafields_edit.tpl.php

htdocs/expedition/shipment.php

htdocs/langs/en_US/admin.lang

htdocs/public/test/test_arrays.php

htdocs/public/test/test_forms.php