Update class.mailparse.php function splitHeaders

function splitHeaders updated in order to correctly parse mail header lines
starting with tabs
user: Fix variable replacement for %{ticket.user}
oops: Fix decoding of piped email attach file names
Merge pull request #953 from greezybacon/issue/895

Update class.mailparse.php function splitHeaders

Reviewed-By: Peter Rotich & Jared
Merge pull request #966 from osTicket/issue/960

user: Fix variable replacement for %{ticket.user}

Reviewed-By: Peter Rotich <peter@osticket.com>
email: Amazon has a new auto-gen email header
forms: Ensure the issue summary will have data

Otherwise, no column will be added to the %ticket__cdata table and the
ticket queue pages will be crashed (empty).
Merge pull request #987 from greezybacon/issue/891

forms: Ensure the issue summary will have data

Reviewed-By: Peter Rotich <peter@osticket.com>
Correctly generate ticket_link for message confirm
Merge pull request #989 from greezybacon/issue/794

Correctly generate ticket_link for message confirm

Reviewed-By: Peter Rotich <peter@osticket.com>
Merge remote branch 'upstream/develop' into develop-next