So we don't have to specify the source and destination type as often.

Change-Id: Id9e286417a1cb246d163cbc3c536b231a4a92624
Reviewed-on: https://gerrit.libreoffice.org/30700Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>
Tested-by: Noel Grandin <noel.grandin@collabora.co.uk>