* [CHD-3113] [Support Center/Logins/Usability] When a Support Center page requires a login, a visitor will be redirected to their original destination after successfully logging in.  Previously, the Support Center didn't even provide a login form to anonymous visitors if they requested a protected resource, it just displayed the default page.  The new process should make it much easier to send contacts direct links to a specific ticket history, or protected knowledgebase articles.
* [Support Center/Usability] By default, the logo image on the Support Center is now a shortcut link back to the default page.
* [CHD-3441] [Support Center] When a customer views a ticket in the Support Center, there is now a reply button per message and no reply from is shown by default.  Previously, a single reply form was always displayed at the top of the ticket which led to much confusion.

* [CHD-3148] [Support Center] When a customer replies to a ticket in the Support Center, the original message will now be automatically quoted in the response.
[Code Cleanup/VA/Scheduled Behavior] Made the scheduled behavior parameter template reusable in Virtual Attendant actions.  This is now used in both 'schedule behavior' and 'run behavior'.
[Code Cleanup] Added more error checking to the VA simulator output routine.
* [Platform/Popups/Usability] Popups are now limited to a height no more than 85% of the current browser height.  Previously, popups could be so tall that they scrolled off the page.  This made them difficult to work with; particularly when dragging them around.
* [Virtual Attendants/Macros/Plugins/Platform] Any Virtual Attendant behaviors that respond an event trigger will now be returned along with a snapshot of their data at their conclusion.  This allows the caller to retrieve detailed information from those responders, and in an arbitrary way.
* [Virtual Attendants/Actions/Run Behavior] Virtual Attendant behaviors may now use a global '(Run behavior)' action.  This is similar to 'Schedule behavior', except it runs the behavior immediately and allows the caller to retrieve values from the delegate behavior.  For example, if one Virtual Attendant delegates another VA's behavior in order to create a task, then the caller can afterwards retrieve information about the created task from the delegate.  This greatly improves the reusability of Virtual Attendants, as specialized VAs can handle routine actions, and helper VAs can delegate requests to them.  This also makes it possible to build mediator VAs that listen on channels like SMS, IM, and Campfire; with requests being delegated to VAs that can do almost anything possible in Cerb: send reminders; create and complete tasks; check and change calendars; interact with Twitter, Facebook, JIRA; etc.
* [Virtual Attendants/Scheduled Behavior] Fixed an issue with the 'Schedule behavior' and 'Unschedule behavior' actions in Virtual Attendants.  Disabled behaviors were not included in the list of available options, so if the actions referred to a behavior while it was disabled, and that action was edited and saved, then it would no longer refer to the behavior afterwards.  Disabled behaviors are now displayed in the action, but they're marked as being disabled in case this is unintentional.
* [Virtual Attendants/Actions] When a Virtual Attendant action is missing, the behavior editor will now provide more helpful information, including an indication of what it was supposed to be.  Previously, a blank action box was shown without providing any clue about what was missing.
* [Support Center/History/Reply] Fixed warnings created by the Support Center when a customer replies to a ticket without any attachments.
Merge branch '6.4.5' into 6.5
* [Virtual Attendants/Actions/Variables/Usability] In Virtual Attendants, the actions for setting variables are now displayed at the top of the available actions.  As with other global actions, they are surrounded by parentheses. Previously these were sorted alphabetically with other 'Set' options, which made them more difficult to find.
6.5-dev checkpoint