Fixed/Implemented: replaced intval() by $app->functions->intval() in all interface functions due to big number problem in intval()

Fixed: Subtemplates can now be given on client creation in remoting (i.e. 10/34/21 for multiple addons)
Changed: template applying moved to separate class
Fixed: force_suexec was not taken from templates

the onUpdate thought we were trying to change the Website because the Options
Datalog didn't have the parent_domain_id and the Ftp User tab did.

Improved client and reseller limit checks

Fixed: FS#810 - FTP - If username is left blank and client clicks options a clientname_ blank username is created.

- Updated the user and database prefixes to use this storage.

Removed server selector from FTP- and Shell-User forms, as the server is always identical with the server ID of the selected website.

- Changed shell of website linux user to /bin/false