[maximusrufus]

Refs #550 (partially: the autocorrelation evaluators; hexagon and circle packing are not changed here).

The second_autocorr_ineq and third_autocorr_ineq example evaluators now reject non-finite function values (and a non-finite reported C3) with a ValueError, which the existing handler returns as an error result.
tests/test_autocorr_evaluators_finite.py checks that NaN, inf and -inf are rejected and that a finite valid program is still scored.
Scores for valid programs are unchanged.

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