Log Message:
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.