- Update to 0.8.0:
  * This release contains significant changes related to the naming, format and
    structure of internal and external data representations. They derive from the
    experience of using Benji in the last few months and from the challenges
    uncovered by the ongoing Kubernetes integration efforts. The changes have been
    bundled to avoid multiple metadata version changes and migrations.
  * Old metadata backups and exports and old object metadata can still be read by
    this version of Benji. Existing databases can be migrated to the new database
    structure with benji database-migrate. While this process has been tested with
    both PostgreSQL and SQLite it is strongly recommended to make a consistent
    backup of the database before attempting the migration. The migration process
    requires a significant amount of time and disk space when there are a lot of old
    backups in the database. The versions and blocks tables are completely recreated
    and the old data is moved over. Expect the disk usage to more than double during
    the migration.
  
  Database and metadata changes:
  * The version of metadata exports has changed from 1.1.0 to 2.0.0. Old
    exports (1.0.0 and 1.1.0) can still be imported.
  * snapshot_name in the versions table has been renamed to snapshot in the
    database and in metadata exports. The long version of the corresponding command
    line option has also been renamed from --snapshot-name to --snapshot.
  * name in the versions table has been renamed to volume in the database and in metadata exports.
  * bytes_dedup in the versions table has been renamed to bytes_deduplicated in the database and in metadata exports.
  * id in the blocks table has been renamed to idx in the database and in metadata exports.
  * The type of uid in the versions table has been changed from integer to
    string. This also affects any metadata exports. This removes the inconsistency
    where uid was represented as a string in some places and as an integer in
    others. uids are automatically generated for new versions, but there is also
    the option to set the uid of a version on backup via the new -u/--uid option.

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