Fixed problems that prevented ISPConfig to run on PHP 7, Issue #3716

Till Brehm

2016-02-09 f1926a01df8871cdacb29c97ffbfd7ff18d1610a

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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;