[Bf-cycles] Volumetric patch update

[storm]

Another update to adopt last trunk changes.

Nothing new related to volume part.

But bi-directional got one step ahead. I played with idea to connect
last light chain vertex directly to camera, and in a turn it give
unexpected nice result in corner case, classic "glass ball in dusty
room" caustics after 4 minute rendering now have same quality as after
10+ hours before. Only light chain used, i still have trouble with
proper weighting between camera(eye) chain and light chain, so better
use them separately. Even better not use it at all, i think a bit later
i can do proper weighting (maybe MIS with rest samples), then it will be
ready for testing.

To turn on light chain only render, you need set 
Integrator type = 1
Mutation number = 0
Max eye bounces = 0
Max light bounces = (something > 0, 4 enough for glass ball)
Of course Max/Min bounces in old Cycles must be set > Max light bounces


Don't pay attention to silly buffer_sample_number per pixel buffer, it
was wrong turn, i remove it completely later, that probability theory
kick me again.


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