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Added: Changed idn function to support multi-line fields (like mail forward)

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

Bugfix: Attachments were not cleaned up on finish() call of mail class (next recipient gets all attachments, too)
Update: some import tests for plesk

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

If you change an auto subdomain of an alias/web-domain there has to be checked if a subdomain with www. or *. has been created already.

Implemented: FS#2427 - Allow wildcard subdomain creation on limit_wildcard = y 

- 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!

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