Changes by: Jason Hickey (jyh at cs.caltech.edu)
Date: 2004-05-04 07:31:06 -0700 (Tue, 04 May 2004)
Revision: 362
Log message:
Use the partial-order sort discussed with Aleksey and Cristian.
This sort is *much* more efficient but it does *not* include
transitivity with files outside the set being sorted.