* Include a `bk` column to store the storage backend
  * Include a `signature` column which represents a repeatable hash of the
    file contents
  * Rename `hash` to `key` since it isn't a real hash

No need to execute signal connect for each request!

SSO was originally used for a SSO plugin. The backend has since been
refactored to support other authentication backends.

The concept of extid is being retired to pave-way for customizatable ticket
numbers.

And deadband session token updates to 1 per 30 seconds

authentication backend.

Fix dropping of materialized view when variable name is changed

Ensure view exists before merging updates

Prevent possible sql injection error in field name used in the materialized
view.

Prevent possible xss error in the display of the field label and variable
name in the admin panel.

Fix adding fields to an existing form

And make plugin internal handling more consistent

And install initial data in target language. Also configure help tip
popovers to be in the configured, default system language.

Ensure aquireLock doesn't interfere with renew/release

Requires authentication plugins to implement a new AuthDirectorySearch
interface to define the two functions

Otherwise, you can't click on the custom form in the table view in order to
manage it.

Fixes osTicket/osTicket-1.8#276

Previously, the user information could only be modified on the ticket-view
page. For instance, if creating a new ticket for a user, no new information
could be added or modified on the user until after the ticket was created

Fixes osTicket/osTicket-1.8#281

Change thread entry title bar to use more flexible layout using div's and
span's in hopes of avoiding unnecessary wrapping -- especially in the poster
name column..

Fixes oversize image display to be resized in both the ticket thread and
the redactor editor in (at least)

  * Ticket-view boxes
  * Client new-ticket form
  * Staff new ticket
  * Page add/edit
  * FAQ add/edit
  * Canned response add/edit

Fixes osTicket/osTicket-1.8#247

If _SERVER{REQUEST_URI} does not start with a leading slash, add one. This
will ensure that the redirect URL offered after a successful login will
be to an absolute url rather than an implied relative one.

Fixes osTicket/osTicket-1.7#858

And add fixup rebase conflicts, and add nice page for unconfigurable plugins

Like HTTP authentication

This includes the initial concept of pluggable authentication along with the
initial concept for a plugin management system.