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Adding new patch, merge2.patch.  Most of this is 
semantically neutral compared to the last version -- more 
asserts, better comments, minor code fiddling for clarity, 
got rid of the weak heapsort.

There is one useful change, extracting more info out of the 
pre-merge "find the endpoints" searches.  This helps "in 
theory" most of the time, but probably not enough to 
measure.  In some odd cases it can help a lot, though.  See 
Python-Dev for discussion.  There's no strong reason to 
time this stuff again, if you already did it once (and thanks 
to those who did!).