The code is a quick hack, still lots that can be done.
- no way to switch from 'migrate' to 'cross-seed' mode
- currently only handles flacs -- need to handle mp3s in reseed.py build_search_queries()
- sort candidates based on how close candidate size is to local torrent size
- need code cleanup / better comments
- code is completely untestable right now
- in migrate mode, maybe mv torrents with no match into an 'unmatched' folder so they're not retested in the next run