Automatically converge when the max - min values become log-convex
Automatically converge when the max - min values become log-convex

The previous heuristic was invalid for smaller precisions, and I believe we
would have had to continually lower it as we increased the degree.

Based on the convergence value plots that I've seen, I believe this heuristic
is a good one.

ergs/transmutagen,ergs/transmutagen