Improve error messages. #64
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- Usage message now explains both args, and does not use square brackets for non-optional args. - Only say that the test data is empty if it actually is. (My answers file was the wrong size, and that triggered the misleading "Test data size must be non-zero." error.) - Use the word "Average" instead of "Sum" in most places to describe the number computed by adding the distances together and dividing by the number of them.
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I got kind of confused by the error messages printed by the Haversine profiler, and had to dig into the code to understand what I did wrong. This PR makes the process smoother for the next person having similar trouble: