Also, add mass delete user with tickets

Feature/tasks stabilize

No Turning Back Now!

Move collaboration implementation to thread level

Also, fix the links to the ticket queue search (again)

When using the php mail() function, the To: header encoded in the Mail_mime
library was not properly transferred to the $to variable passed to the mail
backend. The mail() function will add its own To: header which will
mimic the received destination address.

This patch ensures that the $to parameter is properly encoded.

Looks like Redactor finally quit double urlencoding() the autosave requests
Also, remove ALL drafts after 14 days.