[MERGE] add stracing of specific functions support

[Robert Collins]

This is just a little helper to allow stracing of specific routines from
python. I found the noise of python startup really annoying to wade
through when profiling dirstate.

(It depends on the extended test suite support which is already approved
but not merged till poolie unfreezes mainline).

-Rob
-- 
GPG key available at: <http://www.robertcollins.net/keys.txt>.
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