NEW Converted Form::showLinkedObjectBlock to a static function

dev/skeletons/skeleton_card.php

htdocs/comm/propal.php

htdocs/commande/card.php

htdocs/compta/facture.php

htdocs/compta/facture/fiche-rec.php

htdocs/contrat/card.php

htdocs/core/class/commonobject.class.php

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

htdocs/expedition/card.php

htdocs/expensereport/card.php

htdocs/fichinter/card.php

htdocs/fourn/commande/card.php

htdocs/fourn/facture/card.php

htdocs/livraison/card.php

htdocs/supplier_proposal/card.php