Compound sorting is an existing feature on the Horizon dashboard.
It is not obvious, however.
This change should bring this feature to the attention of users.
It should also guide users into how to use the feature when sorting.
Horizon DataTables.
DocImpact
Closes-Bug: #1287418
Implements: compound sorting
Change-Id: I810e863e01ca54f6751e1608e99ce97833597aff