[issue2403] Add figleaf coverage metrics

[Neal Norwitz]

Neal Norwitz <nnorwitz at gmail.com> added the comment:

Thanks for the patch.  It would be nice to get more instrumentation like
coverage, performance, etc.

Here are some things I noticed while reviewing the patch:

 * This won't work on unix other than OSX.  Can you change
../../python.exe to sys.executable?  
 * How big is figleaf?  Should you try to read/write the file in chunks?
 * optparse doesn't seem to be used.
 * Can you change `cat file` to read the file and pass those as
arguments so this could work on windows?

BTW, does figleaf work on Windows?

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nosy: +nnorwitz

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