Add the topicId to the list of filters
Make Help Topic singular
Allow regular staff members to show assigned open tickets on open queue

Previously only admins and department managers could show assigned tickets
on open queue -even- when the feature is disabled globally. This pull
request extends the same previlege to all agents.
Merge pull request #751 from protich/issue/show-assigned-tickets

Allow regular staff members to show assigned open tickets on open queue

Reviewed-By: Jared Hancock <jared@osticket.com>
Merge pull request #728 from EconomistWhichMBA/topicid-in-filter

Reviewed-By: Peter Rotich <peter@osticket.com>
oops: Fix missing 2nd param to ::lookupByMessageId