Fix identity function derivatives and remove ancient/dead test code #1492
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There has been an errant asterisk in the arguments of the (trivial) derivative method functions for IdentityFunction for an unknown amount of time. These methods did not work, and apparently were never tested.
For years, the bottom of interpolation.py has had a main() function with test code that I wrote in 2015 or 2016. This code is never used or run, and could not be, as it has many obvious errors in it. This commit deletes that old dead code.
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This PR fixes a typo in the derivative methods of interpolation.IdentityFunc that has gone undetected for years. It also (finally) deletes hundreds of lines of unused tests that I wrote it in 2015 and early 2016.