[Bf-cycles] Volumetric patch update

[storm]

First working variant with full MIS betwen all used contributions. One
feature left, direct camera aperture hit, but as i am not support yet
camera DOF, it safe to say that it is now true bidirectional. Despite
bugs, wrong weight scales (i suspect i sill use wrong 4*PI scale
somethere), adgoint assymmetric bsdfs of course.

I still can not believe it work at all, but 3 random indoor scenes
definitely converging faster, at corners, as hint that MIS work almost
correct.

For all brave testers, it is not ready yet, dont waste your time with
it.

I messed with root CMake config file to get it compile on python3.2,
feel free to revert it.

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