Add the current backend to the list results output
Add a --limit switch to support limit results sent to a command like
`migrate`

Allows for backend listing, file listing, single file dump and file
migration.

Allow arguments to have sub-command 'options', so an argument like 'action'
can have a specified list of values, each with respective help output.

Ticket Access Link

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

Ticket owner as well as collaborators can request access link by entering
email and ticket number.

Update recipients count in realtime

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

A ticket owner can't be a collaborator.

Allow clients to edit their information

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

This reverts commit bc773adb.

Ticket count

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

Administrators can disable client edits of ticket information. Hopefully,
this will eventually be replaced by role-based ACLs placed on individual
forms and fields.

Conflicts:
	include/staff/template.inc.php
	scp/js/scp.js

Conflicts:
	include/mysqli.php

Allow staff to cancel user lookup popup when creating a new ticket

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

Make using `realpath` safer

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

The change will allows staff to open a new ticket without going through the
"forced" user lookup popup. On cancel the staff is presented with a
simplified user info form with email and name being the only fields
required.

Include collaborator tickets on search by user.

search: Improve typeahead search results

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

Revisit template management page

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

forms: Allow decl of prompt and default for choices

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

Previously you had to click "Save Changes" for the count to be reflected on
ticket view page.

Fix parameter count to TicketLock::lookup

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

Required for PHP 5.5 compatibility

Fixup search for users with hits in an searchable authentication backend:

  * If there is a hit for the remote backend, include that in the search for
    local users by email address. If there is a hit locally for the same
    email address, then remove the remote hit from the search results.

Fixup typeahead results

  * Abort previous search requests when the user enters more text into the
    search fields. This makes the search box feel more consistent, and
    avoids the case where the user finishes typing and valid search hits
    never appear

Pluggable storage infrastructure

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

If a plugin refuses to be uninstalled, allow it to set an error to be
displayed on the management page.

Add `attrs` field for backend state information (multi-part migration,
multi-part upload, etc). Change `size` to be an integer rather than text
field. (Storage space will be about the same, but int makes more sense).
Size the `key` and `signature` for ~512 bits. The base64 encoding allows
6-bits per char. At 86 chars, we have 516 bits maximum space.

Fixes the rewriting of the `key` field in the ticket thread body. The
storage de-duplication system may replace the `key` value with an existing
one. The ticket thread system will use the `key` value assigned when the
file is committed to the database or the existing key of the duplicate file.

Also fixup installation issues with the attachment storage plugin
architecture

  * 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