[cp-patches] [jessie-nio] merge scatter-gather NIO support

[Casey Marshall]

Hi, I've merged Michael Barker's scatter/gather NIO patch to the jessie-nio branch. I had intended to do a more complete merge of HEAD into the branch, because a lot has changed since I originally made the branch, but it really doesn't seem like it's worth the effort to do that. Good NIO support is something we do need on this branch, though, so I'm taking that code.

Thanks.

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