[Bf-cycles] Sample seed with #frame

[Greg Zaal]

A constant and adjustable seed can be useful in a couple cases since the
noise pattern is predictable, for example when you're trying to find the
cause of certain (but not all) fireflies/noise you can selectively remove
sources of light or materials and see the exact effect it has on the noise
in the scene.

That said, it would be nice to have an option to randomize the seed for
each re-render or for each frame which could be enabled by default as this
might satisfy more users.
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