Add patch from patrick raguin to support minimum for a price

htdocs/admin/produit.php

htdocs/comm/pre.inc.php

htdocs/comm/propal.php

htdocs/comm/stats.php

htdocs/commande/fiche.php

htdocs/compta/facture.php

htdocs/compta/stats/cabyuser.php

htdocs/compta/stats/comm.php

htdocs/html.form.class.php

htdocs/includes/menus/barre_left/eldy_backoffice.php

htdocs/langs/fr_BE/admin.lang

htdocs/langs/fr_BE/main.lang

htdocs/langs/fr_FR/admin.lang

htdocs/langs/fr_FR/commercial.lang

htdocs/langs/fr_FR/compta.lang

htdocs/langs/fr_FR/products.lang

htdocs/lib/functions.lib.php

htdocs/product.class.php

htdocs/product/fiche.php

htdocs/product/price.php