Psycopg2-mq

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- Add a ``schedule_id`` attribute to the job context for use in jobs that want
to know whether they were executed from a schedule or not.

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- Some UnicodeDecodeError exceptions raised from jobs could trigger a
serialization failure (UntranslatableCharacter) because it would contain
the sequence ``\u0000 which, while valid in Python, is not allowed
in postgres. So when dealing with the raw bytes, we'll decode it with
the replacement character that can be properly stored. Not ideal, but
better than failing to store the error at all.

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- Fixed some old code causing the worker lock to release after a job
completed.

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- Log at the error level when marking a job as lost.

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- Copy the ``schedule_id`` information to retried jobs.

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- [breaking] Require ``call_schedule`` to accept an id instead of an object.