New global option to grant reseller users access to the options (advanced) tab in web domains and vhost subdomains

Implemented checkboxes in Interface Config to enable showing/hiding the tabs Mail Filters, Autoresponders and Custom Rules for mailboxes.

See also http://www.howtoforge.com/forums/showthread.php?t=59539

 - added configuration options to server config (web tab, php section)
 - do not update custom php.inis if md5sum file does not exist

- need to have the pecl idn and intl modules installed
  or
- have the idna_convert class in the classes/idn/ path

- New feature: you can now add directive snippets for Apache, nginx, and PHP under System > Directive Snippets. These snippets are then available on the Options tab of a web site where they can be easily added to the respective textarea by simply clicking the name of the directive snippet.

- Implemented session message system (template modifications pending)
- Updated ISPC SVN version number to 3.0.5

Note to all contributors: please use utf-8 encoding in files!

Implemented:  FS#2388 - Optional confirm window on changing tabs

Corrected paths in main tpl

- Added overtraffic notifications to traffic quota system (part of FS#2059 - Extend Traffic quota system)

This option can be enabled under System > Server config and is named "Web folder protection".

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

- 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.