Add option ADHERENT_LOGIN_NOT_REQUIRED

htdocs/adherents/admin/adherent.php

htdocs/adherents/card_subscriptions.php

htdocs/adherents/document.php

htdocs/adherents/note.php

htdocs/categories/categorie.php

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

htdocs/install/mysql/migration/3.0.0-3.1.0.sql

htdocs/install/mysql/tables/llx_adherent.sql

htdocs/langs/en_US/admin.lang

htdocs/langs/fr_FR/admin.lang

htdocs/lib/functions.lib.php