Compute a rational parametrization of a rational normal curve C defined by I.
phi contains the rational parametrization of C over \mathbb{P}^{1} if the degree of C is odd or over a conic if the degree of C is even.
Ic is the 0-ideal for odd degree or the ideal of the conic for even degree.
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Perhaps better return just phi in the quotient ring by Ic.
The object rParametrizeRNC is a method function.