Draft: more workflow managers

Patrick Louis S Connorrequested to merge
feature/workflow_prefixes into master

Reviving the idea of a chain prefix command (see !18 (closed)).

Since meanwhile, we have pushed the transcribe command, this MR also includes two new Python libs:

  • DagWriter (in python/dag.py) to handle DAG jobs (to be used by both transcribe and chain)
  • JobWatcher (in python/watch.py) to watch ongoing HTC jobs (to be used by submit, transcribe, chain)

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