Allow exiting the anneal early via .min_energy#49
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Hey!
Thank you for this very nice library. While simulated annealing is not really that difficult to write from scratch, this library has a very nice abstraction, nice visualization, and the auto() searching for parameters is extremely handy.
I have now used this library a couple of times to generate pretty complex timetables, and it has worked great. What I do find a bit frustrating is that sometimes I know that my problem has an optimal solution and I know what it is, but I have no automatic way of letting the algorithm know that, so it keeps searching even after already finding that solution.
This PR adds a
.min_energymember allowing the user to specify an energy that is acceptable, letting theanneal()exit early.