issue #60: physDesc/physDescStructured
issue #60: physDesc/physDescStructured

physDesc now only contains text. lb, emph, and ref
created new physDescStruct

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