Python improvements in utils/80+-check
Python improvements in utils/80+-check

* The original version had an off-by-one error in the line number
  (assuming you use the GitHub model of starting lines at 1).  Fix this
  error, and move to using `enumerate()` instead of tracking the
  `count` variable ourselves.
* Add a comment about the exit codes to the help message.
* Increase clarity in variable/argument names.

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