Shift data files into data-generating scripts about menelaus HOT 4 CLOSED

Citation for circle data:

Minku, Leandro L. “Datasets.” Leandro L. Minku's Lab Open Source / Data, https://www.cs.bham.ac.uk/~minkull/open-source.html.

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Drafted (untested, uncompared) menelaus.tools.artifacts.make_example_data that duplicates behavior of make_example_data.R on the 38-data-scripts branch.

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• Also updated the pertaining subset of examples/ and fixed a bug in make_example_batch_data. The final piece should just be comparing with example_data.csv / make_example_data.R.

• Afterwards it may make sense to have one combined README.md with sectioned descriptions for any data 'set' added, and to do other cleanup of outdated files as needed.

Also updated path references to the Circle dataset, even though it's left alive for now.

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Just observing mean/std of PyJust observing mean/std of Python vs. R, columns 'a' -> 'j' look right to me, with the exception of column c in 2012:

for 2012 python: (53525.76, 46588.06) and r: (7005.77, 2499.59) 

The drift labels and confidence values align, and the category labels TBD

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