DOI: automatic file download
This PR adds the next part of #25 (closed): the automatic download for additions via DOIs! This will be the last piece of that feature to still go into %3.2. This means, I will not tackle proxies before the next release.
This PR adds the next part of #25 (closed): the automatic download for additions via DOIs! This will be the last piece of that feature to still go into %3.2. This means, I will not tackle proxies before the next release.