Update class.mailparse.php

Best version of https://github.com/osTicket/osTicket-1.8/pull/348

static keyword added to enable strict test mode.
Update run-tests.php

Allow tester to run single test by specifying it on command line: php run-tests.php TestMyThing etc.

Still works for normal tests.
Create test.header_functions.php

Creates a regression test for the parsePriority function, as suggested by GreezyBacon https://github.com/osTicket/osTicket-1.8/pull/348#issuecomment-31326865
Plus-addressing test
oops: Fix ambiguous columns and email flags
Initial concept for user import/export

Implement CLI user import/export in a well formatted CSV file. Name and
email address are the only supported fields at the moment.
email: Fix possible crash if no body in email
Merge pull request #702 from yakatz/patch-1

Plus-addressing test

Reviewed-By: Jared Hancock <jared@osticket.com>
Add ability to skip headers on import
Output headers on export
Fix possible crash if `i18n` folder is not readable
First steps for client login
Profile update for clients
Implement client timezone preference
Add settings page for access control

Add client registration methods and login required checkbox
SQUASHME: Fix missed validation move
Implement password reset for clients
Force login for clients if required
Cancel reset tokens on successful, interactive login
Merge pull request #714 from greezybacon/issue/713

Fix possible crash if `i18n` folder is not readable

Reviewed-By: Peter Rotich <peter@osticket.com>
Merge pull request #707 from greezybacon/issue/706

email: Fix possible crash if no body in email

Reviewed-By: Peter Rotich <peter@osticket.com>