Qual: Remove duplicate code

htdocs/comm/propal.php

htdocs/commande/commande.class.php

htdocs/commonobject.class.php

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

htdocs/facture.class.php

htdocs/fourn/fournisseur.commande.class.php

htdocs/fourn/fournisseur.facture.class.php

htdocs/install/upgrade2.php

htdocs/lib/price.lib.php

htdocs/propal.class.php

mysql/migration/2.2.0-2.4.0.sql

mysql/tables/llx_facture_tva_sum.key.sql

mysql/tables/llx_facture_tva_sum.sql