Resolve "Generalize `image_counts.py` to take in different inputs from CLI"

McDonnell, Marshallrequested to merge
1-generalize-image_counts-py-to-take-in-different-inputs-from-cli-MTM into 1-generalize-image_counts-py-to-take-in-different-inputs-from-cli

Re #1 (closed)

Work includes:

  • commenting out detIDmap that is unused; caused error with script due to accessing non-existent Mantid Workspace
  • Adds -y line to Dockerfile so auto-accepts apt install ... command

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