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:release date: 2011-02-20
* operations can be timed (``poni --clock`` or ``control --clock-tasks``) and
results stored in a log file (``--time-log FILE``), reports printed out with
``poni --time-log FILE report``
* added warning messages for ``control`` tasks that do not send output in a
long while, kill jobs after five minutes of inactivity
* added support for ``optional_requires`` task dependencies, such tasks are not
required to exist but are guaranteed to be run before the dependent task
* ``deploy`` post-process actions are run even if file is unchanged
* bugfix: paramiko ssh connection error is reported neatly
* bugfix: various small fixes