Function: zncharconductor
Section: number_theoretical
C-Name: zncharconductor
Prototype: GG
Help: zncharconductor(G,chi): let G be znstar(q,1) and chi
 be a Dirichlet character on (Z/qZ)*. Return
 the conductor of chi.
Doc: Let \var{G} be attached to $(\Z/q\Z)^{*}$ (as per
 \kbd{G = znstar(q, 1)}) and \kbd{chi} be a Dirichlet character on
 $(\Z/q\Z)^{*}$ (see \secref{se:dirichletchar} or \kbd{??character}).
 Return the conductor of \kbd{chi}:
 \bprog
 ? G = znstar(126000, 1);
 ? zncharconductor(G,11)   \\ primitive
 %2 = 126000
 ? zncharconductor(G,1)    \\ trivial character, not primitive!
 %3 = 1
 ? zncharconductor(G,1009) \\ character mod 5^3
 %4 = 125
 @eprog
