Podcast RSS audio downloader

Episodes are saved exactly as the publisher's feed declares: the original file, nothing re-encoded and no quality options. The enclosure is the publisher pointing at a file meant to be downloaded, and the licence the feed states is shown with the results; a publicly playable episode is not automatically yours to redistribute, so check the licence before sharing. Hosts that refuse browser requests cannot be read here, and that refusal is reported rather than worked around.