Implement dual annealing scheme for simulated annealing in maxlike using scipy.optimize.dual annealing

[MinhMPA]

Hi Joe,

I interfaced two scipy annealing optimizers, dual_annealing and basinhopping into cosmosis maxlike sampler. Just figure it might be useful for others as well. Let me know what you think.

--Minh

References:

• scipy.optimize.dual_annealing
• scipy.optimize.basinhopping