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Generate CHANGELOG.md for 0.8.3

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Changelog for restic 0.8.3 (2018-02-26)
=======================================
The following sections list the changes in restic 0.8.3 relevant to
restic users. The changes are ordered by importance.
Summary
-------
* Fix #1633: Fixed unexpected 'pack file cannot be listed' error
* Fix #1641: Ignore files with invalid names in the repo
* Fix #1638: Handle errors listing files in the backend
* Enh #1497: Add --read-data-subset flag to check command
* Enh #1560: Retry all repository file download errors
* Enh #1623: Don't check for presence of files in the backend before writing
* Enh #1634: Upgrade B2 client library, reduce HTTP requests
Details
-------
* Bugfix #1633: Fixed unexpected 'pack file cannot be listed' error
Due to a regression introduced in 0.8.2, the `rebuild-index` and `prune` commands failed to
read pack files with size of 587, 588, 589 or 590 bytes.
https://github.com/restic/restic/issues/1633
https://github.com/restic/restic/pull/1635
* Bugfix #1641: Ignore files with invalid names in the repo
The release 0.8.2 introduced a bug: when restic encounters files in the repo which do not have a
valid name, it tries to load a file with a name of lots of zeroes instead of ignoring it. This is now
resolved, invalid file names are just ignored.
https://github.com/restic/restic/issues/1641
https://github.com/restic/restic/pull/1643
* Bugfix #1638: Handle errors listing files in the backend
A user reported in the forum that restic completes a backup although a concurrent `prune`
operation was running. A few error messages were printed, but the backup was attempted and
completed successfully. No error code was returned.
This should not happen: The repository is exclusively locked during `prune`, so when `restic
backup` is run in parallel, it should abort and return an error code instead.
It was found that the bug was in the code introduced only recently, which retries a List()
operation on the backend should that fail. It is now corrected.
https://github.com/restic/restic/pull/1638
* Enhancement #1497: Add --read-data-subset flag to check command
This change introduces ability to check integrity of a subset of repository data packs. This
can be used to spread integrity check of larger repositories over a period of time.
https://github.com/restic/restic/issues/1497
https://github.com/restic/restic/pull/1556
* Enhancement #1560: Retry all repository file download errors
Restic will now retry failed downloads, similar to other operations.
https://github.com/restic/restic/pull/1560
* Enhancement #1623: Don't check for presence of files in the backend before writing
Before, all backend implementations were required to return an error if the file that is to be
written already exists in the backend. For most backends, that means making a request (e.g. via
HTTP) and returning an error when the file already exists.
This is not accurate, the file could have been created between the HTTP request testing for it,
and when writing starts, so we've relaxed this requeriment, which saves one additional HTTP
request per newly added file.
https://github.com/restic/restic/pull/1623
* Enhancement #1634: Upgrade B2 client library, reduce HTTP requests
We've upgraded the B2 client library restic uses to access BackBlaze B2. This reduces the
number of HTTP requests needed to upload a new file from two to one, which should improve
throughput to B2.
https://github.com/restic/restic/pull/1634
Changelog for restic 0.8.2 (2018-02-17)
=======================================