Some consistency changes to subgrad_distance #25
Merged
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Changes default exponent to be used in the subgrad_distance function to 2 to mimic the behavior of grad_distance, and changes default atol to 0.
Finally, returns a tangent vector rescaled by rand() after having normalized it, since any tangent vector of norm less than or equal to one is a subgradient of the distance for p=q. This should make it closer to sampling from a normal cone.