Fix absolute path method/upload checking

Andrewrequested to merge
tweak/absolute-path-check into dev

What does this MR do and why?

  • Beef up traversal checking in files.py feeding data to get_absolute_path
  • Fix docstring in get_absolute_path(
  • Resolves threads on !939 (merged)

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  • Have you checked this doesn't interfere/conflict/duplicate someone elses work?
  • Have you fully tested your changes?
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Edited by Andrew

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