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Based on Tim's approval, I have applied this patch as

libdifflib.tex 1.18
difflib.py 1.23
test_difflib.py 1.11
test_difflib_expect.html 1.1
ACKS 1.279
NEWS 1.1118
diff.py 1.4

If you want to make further changes to the code, please
submit them as diff against the current CVS, in a new SF
patch. Please generate this diff through "cvs diff -u" if
possible, as this will put the proper file path into each
chunk, so that patch does not need to ask what file each
chunk applies to.