re-add rewrite ipv6 on mirror - lost in conversion from SVN to git

Florian Schaal

2013-12-24 fbeb11d1d0f491cd4b9a9d730fdc720e758ae26d

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ALTER TABLE `web_domain` ADD `last_quota_notification` DATE NULL DEFAULT NULL;
ALTER TABLE `mail_user` ADD `last_quota_notification` DATE NULL DEFAULT NULL;