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saturation of ideals
HSaturation(I: IDEAL, J: IDEAL): IDEAL 
***** NOT YET IMPLEMENTED *****
This functions returns the saturation of I with respect to J: the
ideal of polynomials F such that F*G is in I for all G in
J^d
for some positive integer
d.
It calculates the saturation using a Hilbertdriven algorithm.
It differs from
saturate
only when the
input is inhomogeneous, in which case,
HSaturation
may be faster.
The coefficient ring must be a field.
/**/ use R ::= QQ[x,y];
/**/ I := ideal(x^4x, y*x2*x);
/**/ saturate(I, ideal(x));
ideal(y 2, x^3 1)
HSaturation(I, ideal(x));  ***** NOT YET IMPLEMENTED *****
