Added: Form fields are disabled if a client is not allowed to edit a domains main settings

Fixed (partly) FS#2310 - Template switch not working in mailuser module, for dashlets and the login page

- Fastcgi: delete .php-fcgi-starter directory if another PHP mode is used.

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

- Fix: IPv6 address must not be '*'.

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

- Fixed FS#1745.

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!

quick workaround for bug: server_id gets "0" when saving again because the input field gets disabled and no value is returned.

added www.-Subdomain option

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Added a server module for clients and a mail plugin.