* [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-3856] [Custom Fields/Files] Fixed an issue with 'file' and 'files' custom fields where the linked attachments could show up multiple times on profiles, peek, and worklists
[Code Cleanup]
6.7.9-checkpoint
* [CHD-3847] [Dashboards/Subtotals] Subtotal widgets may now display more than 20 results.
* [CHD-3822] [Mail/Relay] Fixed an issue where relayed messages could contain blank names in the 'From:' header.
* [CHD-3717] [Notifications/Usability] Fixed an issue where clicking some non-record notifications didn't automatically mark them as read.
* [CHD-3810] [Migration/Custom Fields] Retroactively fixed an issue where certain non-text custom fields (e.g. date, number, worker) weren't properly migrated from groups to fieldsets in 6.4
* [CHD-3574] [Mail/Compose/Drafts] Compose drafts now properly restore the 'owner' field.
* [Mail/Compose/Drafts] Compose drafts now properly restore the 'watchers' field.
* [CHD-3880] [Mail/Compose/Custom Fields] Fixed an issue with composing mail where file-based custom fields could be attached to the message rather than set as a field value.
* [CHD-2563] [Mail/Merge] When viewing the profile of a deleted ticket that was merged, a helper message will display the new ticket location.
6.7.9-release
Merge branch '6.7.9' into stable