"Curve Segment" node: add "NURBS if possible" flag #4740
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Refs #4722.
Depending on NURBS implementation being used, calculation of new NURBS curve representing the segment of initial NURBS curve can give unexpected results in some special cases. So, let's add a flag to disable such calculation and fall back to trivial algorithm of just taking a subdomain of initial curve - that will return a generic Curve object instead of Nurbs, but will not depend on nurbs implementation.
Since this is useful only in rare cases, I put this flag to the N panel.
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