Implemented: FS#555 - Implemet traffic quota.

install/sql/ispconfig3.sql

interface/lib/classes/tform.inc.php

interface/web/client/form/client.tform.php

interface/web/client/form/client_template.tform.php

interface/web/client/form/reseller.tform.php

interface/web/client/lib/lang/en_client.lng

interface/web/client/lib/lang/en_client_template.lng

interface/web/client/lib/lang/en_reseller.lng

interface/web/client/templates/client_edit_limits.htm

...face/web/client/templates/client_template_edit_limits.htm

interface/web/client/templates/reseller_edit_limits.htm

interface/web/sites/form/web_domain.tform.php

interface/web/sites/lib/lang/en_web_domain.lng

interface/web/sites/templates/web_domain_edit.htm

interface/web/sites/web_domain_edit.php

server/cron_daily.php

server/lib/classes/db_mysql.inc.php