- Update to 0.9.0:
  * Sparse blocks are no longer explicitly represented in the database.
    This greatly speeds up the initial step of backup creation if the
    backup is based on an older version, and a lot of the blocks are
    sparse. It also reduces database size and speeds up database
    operations overall due to the reduced number of rows in the blocks
    table. No database migration is necessary, but the changed
    representation will only apply to newly created versions.
  * Implement benji storage-usage command. See the documentation
    on how the usage is calculated and its inherent limitations.
  * For the rbd and rbdaio IO modules add a feature to pass all Ceph
    credentials as part of the URL of the benji backup command. This
    can also be used to pass other Ceph configuration options, and it
    is also possible to override the client_identifier set in Benji's
    configuration file. This allows Benji to connect to any Ceph cluster
    without setting up /etc/ceph/ceph.conf beforehand.
    See the documentation for the full URL syntax.
  * benji enforce now skips removed or otherwise unavailable versions
    and continues with the removal.
  * NBD server: The block cache is split up into a block cache and a
    copy-on-write store for changed blocks. For the block cache a maximum
    size can be specified and least frequently used blocks are evicted if
    the cache gets full. Some adjustments are needed to Benji's
    configuration due to this change. See etc/benji.yaml for an example.

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