Faster knit extraction

[Aaron Bentley]

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Aaron Bentley wrote:
> John, I think you were wondering about a way to apply several patches in
> one pass, to avoid doing insertion in lists of lines.

I should add that I think it's relatively easy to define get_range(),
rather than get_line(), which should be faster, as it requires fewer
per-line operations.  (Basically, you'd be calling list.extend(segment)
a lot, so the extend is a per-line op.)

Aaron
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