Reverted SVN trunk back to revision 3938 to remove changes in default theme an a replacement of the ispconfig logo.

- Added backup size to web backups

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()

- Implemented immediate change of theme on selection
- Fixed error message on incompatible theme

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

Fixed: password match function blocked tabs incorrectly
Fixed: set focus on username input field threw an error if this field did not exist on a page

Corrected paths in main tpl

Addes some missing translations