Comment 3 for bug 1538691

I'm going to put forth two arguments in favor of copies:

* Labeling it "copies" in the UI would make it consistent with the name of the asset.copy database table. However, there are other cases where the interface doesn't match the database table (volumes / asset.call_number), so I don't think it's a strong argument.

* Serials has an entity called "items" that are similar to copies, but are not quite the same thing. Using distinct terms for these two entities might be a good thing.