Feature Request: Cover import from Open Library

[PhilippMundhenk]

It seems currently, covers are not imported when Open Library is used for resolving metadata. It might be relatively quick to add, I dig around a bit, and the open library books json includes the id for the cover, from which the url for the cover can be constructed, allowing download and import, e.g.: https://openlibrary.org/books/OL9025667M.json includes covers[0]=1000595 and cover can be retrieved at https://covers.openlibrary.org/b/id/1000595.jpg.

[PhilippMundhenk]

Looking through the code, it seems cover url is already created correctly (the "-M.jpg" may not be needed, higher resolution image is available at ".jpg"). In my case #26 may interfere, and the wrong ISBN is used to create the cover url. Will review this when #26 is fixed.