Go to the O(logN)-integer-compare implementation, which is about 5% faster...

Go to the O(logN)-integer-compare implementation, which is about 5% faster than the O(1) implementation.  I cannot explain it.  The old stuff is now in {{{omt-with-o1-cursors/}}}.  Addresses #855, #856.

git-svn-id: file:///svn/tokudb@4329 c7de825b-a66e-492c-adef-691d508d4ae1