Knuth maximum demerit value.

[Finn Bock]

Hi,
What is the logic behind the INFINITE_DEMERITS = 1E11 ? Having a 
threshold of 20 can result in a demerit value of

   (1 + 100 * 20 ** 3) ** 2 == 6.400016E11
for the first KnuthNode which is then ignored since it is worse than the 
initial demerit value.

I would guess that when we use a ration of 20, the initial demerit value 
should somehow match.

regards,
finn