CubicCurve2D backports - review

[Denis Lila]

> Would be easier to just attach the result of hg diff which would
> include the patches :-)

Yeah, I thought about that, but I always find it unpleasant to
read the patch contents in an hg diff because of all the '++'
and such.

> Please include a complete backport of 4645692 now.  The tests are important.

Ok. I attached the new hg.diff.
Is this good to go?

Thank you,
Denis.
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