Improvements:
[system] New backup procedure to save the configuration
[system] Set a default SSL certificate for web GUI and API to 2048bits
[api] Added HTTP Headers for API calls to avoid content cache in browsers
[farms] Configurable redirect HTTP codes
[farms] Speed optimization to load SSL SNI certificates list
[gui] Activation certificates expiration notifier
Bugfixes:
[cluster] Leave maintenance mode properly in 3000 and 4000 series
[ipds] Solved some bugs related to RBL rules assignment to farms
[gui] Allowed searches in CN column for Certificates Lists