Merged revisions 3049-3051,3053-3054,3058,3070,3074-3077,3082,3086-3088,3091-3092,3094-3095 from stable branch.

- Make sure the apps vhost gets configured no matter if the ISPConfig interface is installed or not.

- Improved support for multiple PHP versions. Additional PHP versions have now their own form and database table.

- nginx: changed default PHP-FPM values (pm_max_children, pm_start_servers, pm_min_spare_servers, pm_max_spare_servers).

- Added "actions" framework in server to replace the functions provided by the core modules
- Moved system update function from remoteactins core module to software update plugin.

replaced "listen ... ssl;" through "ssl on;" in nginx (ispconfig.vhost) in case that ssl is used for ispconfig

Fixed: PHP Fatal error:  Cannot use string offset as an array in /tmp/trunk/install/lib/installer_base.lib.php on line 638

Cleaned and shortened to be more manageable.  There is no reason to keep all that luggage. Also use multi line sql so a human can read it.

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- Installer adds Apache and nginx user to ispapps group.
- Installer makes sure that /var/www/apps has 755 permissions.

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- Fedora installer: create a symlink from /usr/share/phpmyadmin to /usr/share/phpMyAdmin (nginx only).