As suggested by: https://github.com/osTicket/osTicket-1.8/issues/755

Add ability to disable canned responses
Fix team drop down selection
Remove priority escalation setting in SLA page (implementation is on todo
        list)

Consider closed date to determine ticket's last activity date. The net effect is closed tickets queue will be sorted by closed date.

Departments without email will use the system default email as the default
outgoing email.

The setting is useful in making sure the staff members with access to the
department can get alerts and available as possible assignees.

Add department setting to limit ticket assignment within department to
department members only. This is necessary for departments with strict
policy on who can access tickets.

The setting doesn't limit team assignment or auto-assignment via help topics
and ticket filters.

Provide quick prints options that bypasses the print dialog modal

On validation errors, `$faq` will be set to something non-null, like
`false`, but will not be an instance of a Faq article.

Users with edit permission should be able to change ticket owner in line.

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.

  * Administrator can disable the new activity alert
  * Administrator can disable automatic collaborators from email headers

It was also the last-modified date of the category -- not the actual FAQ
article itself

It was also the last-modified date of the category -- not the actual FAQ
article itself

This is necessary to allow for creative department based access control and
alerts.

This happens when upgrading from 1.6, the company information does not yet
exist (neither do the form tables)

Properly escape company name for display

Background: osTicket allows access to assigned open tickets (both personal
and team assignments) regardless of the assigned department or group. This
is necessary to allow staff to work on tickets in an otherwise restricted
department.

When a staff member closes a ticket, they're credited (ticket.staff_id is
set to staff's id) for the purpose of showing who closed the ticket.
osTicket mistakenly allowed continued access to closed tickets even when the
staff doesn't have access to the ticket based on departmental access.

Join to staff/user tables to get current name when fetching thread entries.

Reported by @ntozier

If the system has only one help topic automatically select the help topic
and display any associated custom form.

Change z-index to overlay popup windows correctly