Avoid "Anonymous" in names of textgroup #302
Description
Some texts ( urn:cts:latinLit:stoa0329 , urn:cts:latinLit:stoa0329c and urn:cts:latinLit:phi9500 ) have an anonymous textgroup. Given the fact that textgroup can be something else than author, I'd probably feel like having a cpt:structured-metadata->author->anonymous at the work level and a textgroup bearing the name of the work (Like "Itinerarium Hierosolymitanum") would be fitting both the model and a better browsing