[Code Cleanup] Reusability of DevblocksEventHelper::getCustomFieldValuesFromParams()
* [CHD-3290] [Security/Logins] When logging out, a worker may now choose 'Sign off (all my sessions)' to expire all their active sessions at the same time.
SQUASH [Code Cleanup]
[Code Cleanup] Fixed some non-static methods in DAO_Ticket that were called statically.  This showed up in PHP strict mode in the pile sorter.
* [CHD-3284] [Mail/Worklists/Piles/Merge] The pile sorter on ticket worklists now allows 'merge' as an action.
[Code Cleanup/Import] The import feature now provides $meta['virtual_fields'] for any keys prefixed with an underscore (_).  This allows cross-record imports, like contact_person -> address.first_name
* [CHD-3265] [Contacts/People/Import] Contact Person records may now be imported in worklists using .CSV (comma-separated value) files.  The supported fields are: email address, password, created date, first name, and last name.
* [Platform/Comments] Comments may now be authored by any kind of record (e.g. app, role, group, worker, email address).  Previously, comments had to be authored by an email address, which didn't make a distinction between workers, customers, or Virtual Attendants.  It would now be possible for the same functionality to mix comments from different sources (e.g. internal and public interfaces).  For example, a knowledgebase article could have customer comments that are shown publicly, with worker comments that are highlighted as authoritative.
* [Virtual Attendant/Simulator] The Virtual Attendant behavior simulator will now show more property values in the popup.  Previously, the simulator was only showing properties that had values, and it wasn't using the lazy loader to look up values on linked records.
* [CHD-3258] [Virtual Attendants/Comments] When Virtual Attendants post a new comment, the author of that comment will now be set to the owner of the VA behavior.  Previously, comments created through Virtual Attendants always showed the author as '(system)', which wasn't very helpful.  Now the app, or any role, group, or worker will be shown instead.
* [Web-API/Comments] Comments on any record may now be searched through the Web-API.  Results may be filtered by target record or author details.
[Web-API/Comments] Fixed 'comments/create.xml' in the Web-API to properly use owner_context and check ACLs for the record and the owner.  Admins can do anything, but workers can only comment as themselves (or a record that isn't an app, role, or group).
[Code Cleanup] Updated copyright headers for 2013; renamed some instances of 'Cerberus Helpdesk' to 'Cerb' in code headers
6.3-dev checkpoint