Update rt3 to version 3.8.1 (from 3.6.6). Changes are:
* New visual style (web2).
* Rich text mails.
* Email signatures and encryption.
* User settings for:
  - Ticket history ordering.
  - Timezones.
  - Date and time format.
  - Username format.
  - Default queue.
  - Size of message text boxes.
* Charts of ticket relationships.
* Breeze through upgrades with new upgrade tools.
* Subscribe to iCalendar feeds of ticket due dates.
* Bookmark frequently-used tickets.
* Turn off mail from RT when you go on vacation.
* Get your mail from RT as a daily or weekly batch.
* Delete historical or spam tickets with RT::Shredder (only as a superuser).
* Set up more configurable business rules with new Scrip Conditions and
  Actions.
* Forward tickets to third-parties from within RT.
* Enable and Disable RT extensions with the new Plugins system.
* Automatically log out inactive users with rt-clean-sessions.
* Run faster with less memory, thanks to numerous  performance improvements
  and bug fixes.
* Fixed a potential HTML injection attck via user's properties.
* Better support for installation on Solaris and FreeBSD (non-GNU make).
* Updates to documentation and scripts for upgrading from MySQL 4.0
* Updated upgrade documentation for the new Queue Tag and bookmarks features.
* Multiple bugs in iCal support fixed.
* Backwards compatibility fixes for extensions developed against 3.6
* Added support for external links in tabs and targets.
* Addition of a new callback before ticket creation so you can implement
  custom validation or stop creation for another reason.
* Missing documentation to external authentication configuration variable
  in bin/rt and make it possible to set it via ENV.
* Merged method in RT::Ticket.

(tonnerre)