Function: ffnbirred
Section: number_theoretical
C-Name: ffnbirred0
Prototype: GLD0,L,
Help: ffnbirred(q,n,{flag=0}): number of monic irreducible polynomials over F_q,
 of degree n (flag=0, default) or at most n (flag=1).
Description:
 (int, small, ?0):int      ffnbirred($1, $2)
 (int, small, 1):int       ffsumnbirred($1, $2)
 (int, small, ?small):int  ffnbirred0($1, $2, $3)
Doc: computes the number of monic irreducible polynomials over $\F_{q}$
 of degree exactly $n$ ($\fl=0$ or omitted) or at most $n$ ($\fl=1$).
Variant: Also available are
  \fun{GEN}{ffnbirred}{GEN q, long n} (for $\fl=0$)
  and \fun{GEN}{ffsumnbirred}{GEN q, long n} (for $\fl=1$).
