Fix first change to fix serious pb with vat definition when using the

htdocs/cashdesk/affContenu.php

htdocs/cashdesk/affIndex.php

htdocs/cashdesk/class/Facturation.class.php

htdocs/cashdesk/facturation_verif.php

htdocs/cashdesk/index_verif.php

htdocs/cashdesk/tpl/facturation1.tpl.php

htdocs/cashdesk/tpl/menu.tpl.php

htdocs/cashdesk/tpl/validation1.tpl.php

htdocs/cashdesk/validation_verif.php

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

htdocs/core/lib/functions.lib.php