stacked radiobuttons horizontally, they have no text now, but img
and tooltip, it looks more sidebar-ish

Change-Id: I6381a2e5e2c056b8928152b9154565eecce7a372
Reviewed-on: https://gerrit.libreoffice.org/17451Reviewed-by: Thorsten Behrens <Thorsten.Behrens@CIB.de>
Tested-by: Thorsten Behrens <Thorsten.Behrens@CIB.de>