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The ChangeRing function enables the changing of the coefficient ring
of an algebra or ideal.
ChangeRing(I, S) : AlgFr, Rng -> AlgFr
Given an ideal I of an algebra F=R[x1, ..., xn] of
rank n with coefficient ring R, together with a ring S, construct
the ideal J of the algebra Q=S[x1, ..., xn]
obtained by coercing the coefficients of the elements of the basis of I
into S.
It is necessary that all elements of the old coefficient ring R
can be automatically coerced into the new coefficient ring S.
If R and S are fields and R is known to be a subfield of S
and the current basis of I is a Gröbner basis, then the basis of
J is marked automatically to be a Gröbner basis of J.
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