Support degenerate tori with negative major radius #157
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This method already supported a degenerate torus with major radius > 0, with a cross-section that includes more than 1/2 of a circle, truncated by a chord across that circle.
This should now support a degenerate torus with major radius < 0, with a cross-section that includes less than 1/2 of a circle, also truncated by a chord across that circle.
Fixes #156