Fix parametricCurve helix approximation - #2094
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Fixes #2084.\n\nThis changes the default smoothing for Workplane.parametricCurve to None. The previous default variational smoothing could severely distort integer-turn periodic-looking curves such as a 4-turn helix.\n\nA regression test covers a unit-radius helix with stop=4 and verifies the sampled radius remains near 1.\n\nTested locally:\n\n
\npython -m pytest tests/test_cadquery.py::TestCadQuery::testParametricCurve tests/test_cadquery.py::TestCadQuery::testParametricCurveHelixIntegerTurns -q\n