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shift is 2.0 by default on Stage C and 1.0 by default on Stage B.

This doesn't affect how percentages behave in the frontend but breaks
things if you relied on them in the backend.

percent_to_sigma goes from 0 to 1.0 instead of 1.0 to 0 for less confusion.

Make percent 0 return an extremely large sigma and percent 1.0 return a
zero one to fix imprecision.

This allows changing the sampling parameters of the model (eps or vpred)
or set the model to use zsnr.