Merge branch 'master' of /home/git/repositories/florian030/ispconfig3

interface/lib/classes/functions.inc.php

interface/web/mail/mail_user_stats.php

interface/web/mail/templates/mail_user_stats_list.htm

interface/web/mail/user_quota_stats.php

interface/web/sites/templates/web_sites_stats_list.htm

interface/web/sites/user_quota_stats.php

interface/web/sites/web_sites_stats.php

server/lib/classes/cron.d/500-backup.inc.php

server/lib/classes/functions.inc.php