`gf2nton'
---------

gf2nton(M)
     :: Converts an element of GF(2^N) into a non-negative integer.

RETURN
     non-negative integer

M
     element of GF(2^N)

   * The inverse of `gf2nton'.

     [1] setmod_ff(x^30+x+1);
     x^30+x+1
     [2] N=gf2nton(2^100);
     (@^100)
     [3] simp_ff(N);
     (@^13+@^12+@^11+@^10)
     [4] gf2nton(N);
     1267650600228229401496703205376
     [5] gf2nton(simp_ff(N));
     15360

References
     *Note `gf2nton': gf2nton

