Improve batch/grid submission
@pgadow added great support for submitting to HTCondor batch systems in !169 (merged). Some related tasks
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add support to submit to the GRID -
improve the slurm batch support to match the functionality of the HTCondor submission (i.e. automatically write the submission script from python). Ideally this would use a common backend with a submission script writer for either HTCondor or Slurm.