[MERGE] osutils.copy_tree helper function

[John Arbash Meinel]

In writing some code, I wanted the ability to recursively copy a bunch
of directories (like shutil.copy_tree()), but I wanted the ability to
use a custom function per file. (Specifically, I wanted to optionally
hard link files, rather than copying their contents).

So I wrote one, which is a wrapper around osutils.walkdirs().

I'm using it to improve the benchmark suite a bit, so that we can cache
some of the intermediate steps (like creating a kernel like tree with a
single commit). This makes the benchmarks a little bit easier to run,
since you don't have as much time spent just preparing the benchmark.

John
=:->
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