Uniformize code

ChangeLog

htdocs/compta/facture.php

htdocs/core/class/html.form.class.php

htdocs/core/lib/functions.lib.php

htdocs/main.inc.php

htdocs/product/admin/product_tools.php

htdocs/product/canvas/product/actions_card_product.class.php

htdocs/product/canvas/service/actions_card_service.class.php

htdocs/product/card.php

htdocs/product/fournisseurs.php

htdocs/product/price.php

htdocs/societe/price.php