getArhivedFilesInfo() for OMERO 4 images
Add archivedFilesInfo to filesetInfo
Add BlitzGateway getFilesetFilesInfo() and getArchivedFilesInfo()
Blitz count*Files() uses get*FilesInfo()
web uses conn.getFilesetFilesInfo() methods
Blitz getImportedFilesInfo() new method
Web uses image.getImportedFilesInfo()