from_div_powers

Usage:
    <from_div_powers1 f g
Write a polynomial f in the divided power algebra in terms of
ordinary powers.
Parameters:
  f = 1x1 matrix.
Output values:
  g = result 1x1 matrix.
The monomials of f are to be interpreted as monomials in the divided
powers.  Thus if f = x2+y3z2 then f is to be interpreted
as x^(2) + y^(3) z^(2), and g = (1/2)x2+(1/12)y3z2.