Function: nfeltmod
Section: number_fields
C-Name: nfmod
Prototype: GGG
Help: nfeltmod(nf,x,y): gives r such that r=x-qy is small with q algebraic
 integer.
Doc:
 given two elements $x$ and $y$ in
 \var{nf}, computes an element $r$ of $\var{nf}$ of the form $r=x-qy$ with
 $q$ and algebraic integer, and such that $r$ is small. This is functionally
 identical to
 $$\kbd{x - nfmul(\var{nf},round(nfdiv(\var{nf},x,y)),y)}.$$
