persist copy_job output to DB and display it when task has completed. #397
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We have now added persistence of copy task output to the DB. Upon the completion of a copy job, the output and error will be stored in the DB. Upon a user clicking a task, if the task is has completed, we deliver the final output and error from the DB. If the task is active, then we deliver the stderr and output directly from celery (ie same behavior as before).