Merge branch '5.0' of git@github.com:Dolibarr/dolibarr.git into develop

htdocs/comm/mailing/card.php

htdocs/comm/mailing/cibles.php

htdocs/comm/mailing/class/mailing.class.php

htdocs/comm/mailing/list.php

htdocs/compta/facture.php

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

htdocs/contact/agenda.php

htdocs/contact/card.php

htdocs/core/class/commonobject.class.php

htdocs/core/class/discount.class.php

htdocs/core/class/html.formmargin.class.php

htdocs/core/class/html.formprojet.class.php

htdocs/core/lib/security.lib.php

htdocs/core/modules/mailings/advthirdparties.modules.php

htdocs/core/modules/mailings/contacts1.modules.php

htdocs/core/modules/mailings/contacts2.modules.php

htdocs/core/modules/mailings/contacts3.modules.php

htdocs/core/modules/mailings/contacts4.modules.php

htdocs/core/modules/mailings/example.modules.php

htdocs/core/modules/mailings/fraise.modules.php