Merge pull request #3979 from atm-alexis/3.9_NEW_add_billed_status_for_supplier_order

htdocs/core/menus/standard/eldy.lib.php

htdocs/fourn/card.php

htdocs/fourn/class/fournisseur.commande.class.php

htdocs/fourn/commande/card.php

htdocs/fourn/commande/list.php

htdocs/fourn/commande/orderstoinvoice.php

htdocs/install/mysql/migration/3.8.0-3.9.0.sql

htdocs/install/mysql/tables/llx_commande_fournisseur.key.sql

htdocs/install/mysql/tables/llx_commande_fournisseur.sql

htdocs/langs/en_US/orders.lang