This include URLs in embedded links as well as URLs for external images and
videos embedded via iframe elements.

Also add images on pages to the drop-down list for image choosing, and fix
display of images on the client portal.

Fixes #138

Allows the client to be changed on a ticket. Previously, only the
information about the client associated with the ticket was editable. This
patch permits assigning a completely different user to the ticket.

Fixes a case where multiple tickets are created in one request (such as a
cron job triggering multiple email fetches). The TicketForm::getInstance()
called in Ticket::create() used a singleton pattern to retrieve a cached
instance of the TicketForm. In the case of ticket creation, each ticket
needs a new TicketForm entry instance.

  * Upgrade to Redactor 9.1.7
  * Use a (x) icon from font-awesome for the dialog

Ultimately, in the user information ("contact information") form, forbid
updating a user's email address to an email address in use by another user.
Because email addresses are a unique identifier of user accounts, they
cannot be reused between different users.

Fixes #126

Before, the draft was only cleaned up when progress on the ticket was
tracked with the reply box.

Validation errors in user form were not displayed on the interface

Fixes #111

If an email arrives in the system without a "personal" field (name), the
email address is used as the name. The email address, however, is not parsed
well by the PersonsName constructor. This patch uses the mailbox of the
email address as the name.

Also include a slight boost to the mbstring compatibility functions declared
in the bootstrap::i18n_prep() function

And extend the information to email templates

When localized date formatting was implemented, saving of those dates in the
database was broken. This fix correctly handles custom date fields to/from
the database.

The typeahead for user email address was dropped somewhere along the way

Filters should not be run alongside basic ticket validation

Fixes #23

Fixes #77

If a form field is required, then a name will be necessary in order to plumb
up the API.

The quickList() method will attempt to ask the database to find filters that
might match the incoming ticket information. The idea is that MySQL is
likely faster than PHP. The problem is that it assumes positive logic is
being utilized.

This patch adds all filters with at least one rule with dn_contain
(does-not-contain) or not_equal (not-equal)

Add information about current software versions, server software, php
extensions loaded, and database space usage.

In the future, this will offer a nice place to add an import/export button
for data backup and restore, announcements, and more