New: Support the Non Percu Recuperable vat in invoice form

htdocs/commande/commande.class.php

htdocs/compta/facture.php

htdocs/compta/facture/facture-rec.class.php

htdocs/contrat/contrat.class.php

htdocs/facture.class.php

htdocs/fourn/fournisseur.commande.class.php

htdocs/fourn/fournisseur.facture.class.php

htdocs/html.form.class.php

htdocs/install/upgrade2.php

htdocs/lib/functions.inc.php

htdocs/lib/price.lib.php

htdocs/propal.class.php