I don't know what changed, but apparently something did. We're using
fetchzip and the 0.14 tag doesn't seem to have moved (AFAICS).
Build and run-tested.
For reference, the (current) annotated tag '0.14' is dated
"Wed Dec 17 23:32:11 2014 +0100" and points to commit
f342621dff8065b29aeda238ccce5ac92d04f5b6 ("Preparing release").
Without this one cannot mount the backup repository:
$ attic mount /backups/backup.attic mnt
attic: the "llfuse" module is required to use this feature
attic: Exiting with failure status due to previous errors
fetchzip calculates the hash of the extracted archive, so that
(irrelevant) changes done to the dynamically generated archive doesn't
cause our hash to be outdated.
