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>

Separate authentication strike (excessive login attempts) count from timeout
enforcement.

Conflicts:
	include/class.forms.php