- Update to 8.0.0
  * This is marked as a major revision because of the change to
    pass connection information via environment variables.
    BatchSystem launchers with a custom template will need to make
    sure to set flags that inherit environment variables, such as
    #PBS -V or #SBATCH --export=ALL.
  * More convenient Cluster(engines="mpi") signature for setting
    the engine (or controller) launcher class.
  * The first (and usually only) engine set can be accessed as
    .Cluster.engine_set, rather than digging through the
    Cluster.engines dict.
  * Add environment configuration to all Launchers.
  * Support more configuration via environment variables, including
    passing connection info to engines via $IPP_CONNECTION_INFO,
    which is used by default, avoiding the need to send connection
    files to engines in cases of non-shared filesystems.
  * Launchers send connection info to engines via
    $IPP_CONNECTION_INFO by default. This is governed by
    Cluster.send_engines_connection_env, which is True by default.
  * Support EngineLauncher.get_output via output files in batch
    system launchers
  * Capture output in Batch launchers by setting output file
    options in the default templates.
  * LoadBalancedView.imap returns a LazyMapIterator which has a
    .cancel() method, for stopping consumption of the map input.
  * Support for return_when argument in .AsyncResult.wait and
    ~.AsyncResult.wait_interactive, to allow returning on the first
    error, first completed, or (default) all completed.
  * LoadBalancedView.imap(max_outstanding=n) limits the number of
    tasks submitted to the cluster, instead of limiting the number (forwarded request 931406 from bnavigator)

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