Remove SQL changes that were executed in previous schema version diffs already
Enqueue downloads for CoreNLP annotation by fetching chunks of 100 downloads and enqueueing them one-by-one (similarly to how the "mediawords_copy_downloads_to_gridfs.pl" used to do it); add support for script resuming and limiting the script to a single "media.media_id"
Merge branch 'corenlp_enqueue_downloads_in_chunks'