6.13

• Added support for backing up to BackBlaze.
• Added a cron job to clean up old PHP session files.
• Fixes to creation and update of per-domain Dovecot SSL certs.
• Improved the template page for website options when Nginx is in use.
• Better handle PHP FPM package upgrades done after domains are created.
• Massively improved support for MySQL / MariaDB user and password management.
• Improved and preserved indentation for Apache configs.
• Fixes for IPv6 addresses in SPF and default DNS records.
• Fixed bugs caused by removing domain features in the wrong order.
• Improved locking for domain database files to prevent overwriting.