EAD Work

    Updated the SobekCM Type to have a special 'ead' type
    The citation is now renamed 'description' for ALL items
    Regular citation is just replaced with the archival description (EAD_Description_ItemViewer) for EADs
    Added ability to download EAD from the metadata option in the citation itemviewer
    Updated the two EAD item viewers and the item style sheet for EAD views