[Code Cleanup]
* [Web-API/Search/Tickets] In the Web-API, 'tickets/search.json' now provides a 'links' filter for returning tickets that are linked to other records or record types.  This filter should always use the 'in' operator, and the values should be provided as a JSON-formatted array of contexts or context:id pairs.

* [Web-API/Search/Time Tracking] In the Web-API, 'timetracking/search.json' now provides a 'links' filter for returning time tracking entries that are linked to other records or record types.  This filter should always use the 'in' operator, and the values should be provided as a JSON-formatted array of contexts or context:id pairs.
* [CHD-3829] [Search/Sphinx] When using the Sphinx search engine, errors are now handled more gracefully if the service isn't running.
* [CHD-3540] [Calendars/Usability] Calendars can now be configured to display start times for all displayed events in the grid.  These times use the 12-hour or 24-hour clock from each worker's preferences.
* [CHD-1238] [CHD-3831] [Calendars/Localization] Each calendar can now be configured to start the week on either Sunday or Monday.  Availability calendars will use the setting from the calendar they are based on (e.g. a worker's schedule).
* [Placeholders/Snippets/Virtual Attendants] Ticket records have a new 'requester_emails' placeholder that contains a comma-separated list of recipients on the ticket.  This can be used to simplify email-based actions on Virtual Attendants.
Merge branch '6.7.9' into 6.8
* [Virtual Attendants/Action/Create Ticket] The 'Create Ticket' action in Virtual Attendant behaviors may now specify a status and reopen date.
* [Virtual Attendants/Behaviors/Variables] Virtual Attendant 'Yes/No' behavior variables can now be configured to have a default state in the input form. Previously the form value always defaulted to 'No'.
[Code Cleanup]
6.8-dev checkpoint