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Currently logging and progressbars conflict somewhat. Make them hidden
for now.

This is needed to only (re)download files that have changed (size or
last-modified).

It's starting to look like a reimplementation of an actor model, maybe
just use riker?

Fixes issues with the last documents not being indexed.

They fixed the issue with partially encrypted files, so stop using our
hack

The broadcast channel can loose messages which is not what we want here.
Instead use the mpsc channel and block if it's full

Catch some more errors in the tasks
Handle non-2xx HTTP responses as failures

Related: #1

Previously indexed files would not be downloaded even if given the -s
option. Now we save them if they weren't present before

Related: #1