- Added backup size to web backups

  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

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

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

http://bugtracker.ispconfig.org/index.php?do=details&task_id=1689

Using these variables in welcome email from admin, when mailbox is created.

Added a new module called "domain". With this module you can manage all domains (web + mail). Per default this module is not active. To activate it, you have to change the System Interface Config -> domains -> use the domain module. You also have to activate the domain-module for the admin (and for every client if you want). Important: you can not use this module if you have reseller!

- Formatted error messages for better visibility.