Remove warnings

htdocs/includes/boxes/box_actions.php

htdocs/includes/boxes/box_clients.php

htdocs/includes/boxes/box_commandes.php

htdocs/includes/boxes/box_energie_releve.php

htdocs/includes/boxes/box_factures.php

htdocs/includes/boxes/box_factures_fourn.php

htdocs/includes/boxes/box_factures_fourn_imp.php

htdocs/includes/boxes/box_factures_imp.php

htdocs/includes/boxes/box_fournisseurs.php

htdocs/includes/boxes/box_produits.php

htdocs/includes/boxes/box_propales.php

htdocs/includes/boxes/box_prospect.php

htdocs/includes/boxes/box_services_vendus.php

htdocs/includes/boxes/modules_boxes.php

htdocs/lib/databases/mssql.lib.php

htdocs/lib/databases/mysql.lib.php

htdocs/lib/databases/mysqli.lib.php

htdocs/lib/databases/pgsql.lib.php

htdocs/lib/functions.lib.php