Mutualize code to show block to link an element to another one.

dev/skeletons/skeleton_page.php

htdocs/comm/askpricesupplier/card.php

htdocs/comm/propal.php

htdocs/commande/card.php

htdocs/compta/facture.php

htdocs/contrat/card.php

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

htdocs/expedition/card.php

htdocs/fichinter/card.php

htdocs/fourn/commande/card.php

htdocs/fourn/facture/card.php

htdocs/livraison/card.php