- Don't set partition type if the default 0x83 type is requested
  In that case it's not needed to set a partition type because
  the parted default type is the same. In addition this workarounds
  the problem that the SUSE 'type' extension is no longer present
  in parted 3.x
- Added 'pvscsi' and 'lsisas1068' as allowed disk controller types
- Fixed handling of volume size if no size/freespace is set
  In this case a default freespace of 20MB applies