Remove assignment warning

Reviewed-By: Jared Hancock <jared@osticket.com>

Revert click to preview change.

Reviewed-By: Jared Hancock <jared@osticket.com>

The warning was meant to be humorous but apparently the world has no sense
of humor.

Fix packager and deployment issues

Reviewed-By: Peter Rotich <peter@osticket.com>

Conflicts:
	include/class.user.php
	include/staff/tickets.inc.php

Restrict access to closed tickets based on staff's access control.

Reviewed-By: Jared Hancock <jared@osticket.com>

oops: Enable adding collaborators from email

Reviewed-By: Peter Rotich <peter@osticket.com>

Ensure the email doesn't already exist before creating it.

Reviewed-By: Jared Hancock <jared@osticket.com>

html: Drop xml processing instructions from email

Reviewed-By: Peter Rotich <peter@osticket.com>

Show selected signature in the rich text editor

Reviewed-By: Peter Rotich <peter@osticket.com>

mysqli: Numbers with leading zeros are strings

Reviewed-By: Peter Rotich <peter@osticket.com>

Fix ambiguous `due date` if specified as custom field

Reviewed-By: Peter Rotich <peter@osticket.com>

upgrader: Fix upgrade from osTicket 1.6

Reviewed-By: Peter Rotich <peter@osticket.com>

Allow manager to be set even when a department has no members

Reviewed-By: Jared Hancock <jared@osticket.com>

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

Fix canned append in non-HTML mode

Reviewed-By: Peter Rotich <peter@osticket.com>

Preserve inline image floating in ticket thread

Reviewed-By: Peter Rotich <peter@osticket.com>

oops: Don't crash on setting Return-Path

Reviewed-By: Peter Rotich <peter@osticket.com>

file: Use the database to save files as a failsafe

Reviewed-By: Peter Rotich <peter@osticket.com>

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.

file: Fix saving backend char

Reviewed-By: Peter Rotich <peter@osticket.com>

Fix export of custom list fields

Reviewed-By: Peter Rotich <peter@osticket.com>