Hakan Ardo committed c541bb3

Explain the step-one-xrange branch

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 The directory "lib-python/modified-2.7" has been removed, and its
 content merged into "lib-python/2.7".
 .. branch: step-one-xrange
+The common case of a xrange iterator with no step argument specifed
+was somewhat optimized. The tightest loop involving it,
+sum(xrange(n)), is now 18% faster on average.
 .. branch: string-NUL
 PyPy refuses filenames with chr(0) characters. This is implemented in
 RPython which can enforce no-NUL correctness and propagation, similar