New: Enhancement on sending email.

htdocs/actioncomm.class.php

htdocs/admin/mails.php

htdocs/admin/tools/listevents.php

htdocs/comm/mailing/fiche.php

htdocs/comm/propal.php

htdocs/commande/fiche.php

htdocs/compta/facture.php

htdocs/html.formmail.class.php

htdocs/langs/en_US/mails.lang

htdocs/langs/fr_FR/mails.lang

htdocs/telephonie/client/facture.php