Function: zetak
Section: number_fields
C-Name: gzetakall
Prototype: GGD0,L,p
Help: zetak(nfz,s,{flag=0}): Dedekind zeta function of the number field nfz
 at s, where nfz is the vector computed by zetakinit (NOT by nfinit) flag is
 optional, and can be 0: default, compute zetak, or non-zero: compute the
 lambdak function, i.e. with the gamma factors

