Uniformize code

dev/skeletons/skeleton_class.class.php

htdocs/comm/action/class/actioncomm.class.php

htdocs/comm/propal/class/propal.class.php

htdocs/commande/class/commande.class.php

htdocs/compta/facture/class/facture.class.php

htdocs/core/class/doleditor.class.php

htdocs/main.inc.php

htdocs/projet/class/project.class.php

htdocs/projet/class/task.class.php

htdocs/projet/info.php

htdocs/societe/class/societe.class.php

htdocs/supplier_proposal/class/supplier_proposal.class.php