[Fix]Added extra check, passed current active session id to tiki-download_file.php to check if user is coming from valid active session before pdf generator is allowed to access images.
[Fix]Added extra check, passed current active session id to tiki-download_file.php to check if user is coming from valid active session before pdf generator is allowed to access images.

git-svn-id: a7fabbc6a7c54ea5c67cbd16bd322330fd10cc35@59029 b456876b-0849-0410-b77d-98878d47e9d5

tikiorg/tiki,oregional/tiki,tikiorg/tiki,oregional/tiki,tikiorg/tiki,oregional/tiki,tikiorg/tiki,oregional/tiki