[MERGE] 22% Faster logs by optimizing get_texts

[Aaron Bentley]

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Hi all,

This patch continues my log performance work, by implementing get_texts
so that it is a single readv operation.

Note that it was also necessary to sort the records before sending them
to readv-- should readv do its own sorting?

Before the patch the test ran in 626 ms.  Now it runs in 510.

Also, I've done a little clean-up work.

Aaron
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