- Installer adds ispconfig user to Apache group on Fedora/CentOS so that nginx/PHP-FPM can access /etc/squirrelmail and serve SquirrelMail for the ISPConfig vhost.
- Added session.save_path and upload_tmp_dir settings to the PHP-FPM pool definitions.

- Added empty function configure_fail2ban() to get rid of the following fatal error during installation on non-Debian/Ubuntu systems: PHP Fatal error:  Call to undefined method installer::configure_fail2ban() in /tmp/trunk/install/install.php on line 266

- Added support for the /etc/nginx/sites-available and /etc/nginx/sites-enabled directories on Fedora/CentOS to the installer.

- Fixed "PHP Notice:  Undefined property: installer::$ispconfig_interface_installed in /tmp/trunk/install/update.php on line 337" when updating an ISPConfig server with nginx.

Changed PHP-FPM socket directory from /var/run/php5-fpm to /var/lib/php5-fpm because /var/run is cleand up on reboot.

- Added SNI config field in sysetm > server config > web.

Implemented: FS#1113 - Force client to use only allowed IPs

- Enabled Security Level (Server Config > Web > Security Level) for nginx.

- Added SEO redirects (both Apache & nginx) to redirect from non-www website to www website or vice versa.
- Introduced placeholder [scheme] for redirect paths for alias and subdomains; will be replaced with http or https, depending on what the visitor uses.

fix #1747 - check for amavised for postfix rules -> pure webserver need for php sendmail, most often postfix is used for it, because admin know it. I checked different repos for differnet names, alwas amavsid or with -new.

Removed unused database tables: 

DROP TABLE `mail_greylist`;
DROP TABLE `firewall_filter`;
DROP TABLE `firewall_forward`;
DROP TABLE `proxy_reverse`;

- Added tables for web folder protection.

- Added fields for IPv6 support and virtualhost Port Configuration to server_ip table