Function: zncoppersmith
Class: basic
Section: number_theoretical
C-Name: zncoppersmith
Prototype: GGGDG
Help: zncoppersmith(P, N, X, {B=N}): finds all integers x0
 with |x0| <= X such that  gcd(N, P(x0)) > B. X should be smaller than
 exp((log B)^2 / (deg(P) log N)).

