refers to pseudocode in "On pruning and gorwing kn..."

GrowOrder, line 12:
	   precompute C(hw) log P_KN(w|h) with ML estimates for 
	   P_KN before add_gram. Check if add_gram can ever possibly 
	   be needed : IMPLEMENTED 12.9.2006, only slightly faster execution

GrowOrder, line 5:
	   probabilities for a history can be precomputed and used in 
	   all probability calculations