fixes to physdesc* attrs; #225, remove extent from physdescstructured
fixes to physdesc* attrs; #225, remove extent from physdescstructured

SAA-SDT/EAD-Revision,informaticmonad/EAD3,informaticmonad/EAD3,SAA-SDT/EAD3,SAA-SDT/EAD3,SAA-SDT/EAD-Revision