Streaming clone and local (non --pull) clone do mostly the same thing,
however they were using different logic to do so. This means the logic
frequently went out of sync and that new case had to be dealt with twice.
This is fragile and anoying. So we replace this with a re-use of the logic we
use for streaming clone.
I can see various test changes:
- a more precise progress output,
- armless fncache loading during clone,
- fncache is no longer hardlinked (since we write it by hand).
I am not reinstalling the reposimplestore specific output, as far as I
understand this variant have been broken for years.
s/happening/appending/ <- this one is a bit too much