and combine the Create/Clone methods into one

Change-Id: Ia982be6b50135b8d368d84070327689be6b3d890
Reviewed-on: https://gerrit.libreoffice.org/52745Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>