Merge pull request #481 from greezybacon/issue/email-thread-pk

include/class.dynamic_forms.php

include/class.filter.php

include/staff/filter.inc.php

include/upgrader/streams/core.sig

include/upgrader/streams/core/ed60ba20-934954de.patch.sql

include/upgrader/streams/core/f1ccd3bb-f5692e24.cleanup.sql

include/upgrader/streams/core/f1ccd3bb-f5692e24.patch.sql

include/upgrader/streams/core/f1ccd3bb-f5692e24.task.php

setup/inc/streams/core/install-mysql.sql