[MERGE] Faster LocalTransport.put() and append() methods.

[Robert Collins]

Seeking a +1.

This patch changes AtomicFile to be more targeted at the way we use it,
rather than a general safe-for-everything tool. It also changes
LocalTransport.append() to have less syscalls while being no longer.

The combination takes making a kernel_like_tree down from 7.3 seconds to
1.5, which makes some benchmarks much more pleasant to run.

This is in my add() branch, where i'm currently fiddling stuff.

Rob
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