fix test-cases

overwrote crash-1.xls by accident in

commit d2281e20
Author: Caolán McNamara <caolanm@redhat.com>
Date:   Fri Oct 2 10:41:25 2015 +0100

    fix crash on loading certain xls

    Change-Id: I2dd58060c1f3c9f12356c4ab18a0c838e7cdd718

so restore that, add another test case for...

commit c4d1a99e
Author: Caolán McNamara <caolanm@redhat.com>
Date:   Sat Oct 3 11:53:48 2015 +0100

    fix crash on loading certain xls

    Change-Id: I4f4563b07109df7e2288458cf8adda37582262cf

as crash-4.xls

and add d2281e20 test-case in

as crash-5.xls

Change-Id: I2de3986290bdf5e227e4471e411bb6a9a83b3085