New: Add navigation between subscriptions cards.

htdocs/adherents/adherent.class.php

htdocs/adherents/adherent_options.class.php

htdocs/adherents/adherent_type.class.php

htdocs/adherents/card_subscriptions.php

htdocs/adherents/cotisation.class.php

htdocs/adherents/cotisations.php

htdocs/adherents/fiche.php

htdocs/adherents/fiche_subscription.php

htdocs/adherents/htpasswd.php

htdocs/adherents/index.php

htdocs/adherents/info_subscription.php

htdocs/adherents/ldap.php

htdocs/adherents/liste.php

htdocs/adherents/note.php

htdocs/adherents/options.php

htdocs/adherents/pre.inc.php

htdocs/adherents/type.php

htdocs/includes/modules/modAdherent.class.php

htdocs/langs/fr_FR/members.lang