If an email loop is detected, in addition to dropping the message, also log
an error to the system log, but do not send an email to the administrator in
the event that it is the administrator's email that is looped.

Outbound message-ids are predictable, with a consistent code unique and
static to each osTicket installation. This will help detect email loops
where message is delivered back to the system in an email loop.

This approach will help detect responses to the ticket thread from mail
clients which do not include the References and In-Reply-To MIME headers.
This also allows the Subject line to continue to omit the ticket number.

Conflicts:
	setup/test/tests/stubs.php

Careful transcoding attachments with a charset

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

tnef: Strip null bytes from attachment filenames

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

If a non-text attachment specifies a charset in the content-type header,
don't transcode the content before saving it to the database. This can
corrupt attachments which have a header like the following:

Content-Type: application/pdf; charset=UTF-8

Since a PDF contains binary data, coercing it to UTF-8 encoding will drop
characters not valid in UTF-8 and will corrupt the attachment data.

Also support the TransportName in the properties list and prefer it over the
attachment-level attribute, as it is Unicode encoded.

filter: Implement priority 

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

The priority setting was broken when priority was added to the dynamic data

auth: Forbid password reset for non-local users

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

Register session close on shutdown at the start of session handling

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

Add delivered-to detection to mail fetcher

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

pipe: Honor attachment ext and size restrictions

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

smtp: Reuse existing connections where possible

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

tnef: Support TNEF for fetched emails

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

This is necessary to make sure session data is saved on redirect.

Also allow an administrator to lift the force password change flag without
specifying a new password.

Duplicate delivered-to handling from mail parse as temp. solution.

Previously, the data blocks were inspected byte for byte. Now data blocks
are parsed 1k at a time. Fewer PHP function calls ultimately means faster
performance.

Conflicts:
	include/class.client.php
	include/class.usersession.php

Conflicts:
	include/class.client.php
	include/class.usersession.php

Conflicts:
	include/class.client.php
	include/class.usersession.php

auth: Ensure session token is cleared on logout

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

Parse Microsoft TNEF email attachments

Peter Rotich <peter@osticket.com>

Shift error checking into Mail_Parse::parseAddressList

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

Add ability to audit failed logins attempts

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