Function: factormod
Section: number_theoretical
C-Name: factormod0
Prototype: GGD0,L,
Help: factormod(x,p,{flag=0}): factorization mod p of the polynomial x using
 Berlekamp. flag is optional, and can be 0: default or 1: simple factormod,
 same except that only the degrees of the irreducible factors are given

