PermutationCorrelator class to complement Iman-Conover

[tommyod]

First draft :)

IC 0.6814106962477919
Running permutation correlator for 500 iterations.
 Iteration 50  Error: 0.3438
 Iteration 100  Error: 0.3087
 Iteration 150  Error: 0.2772
 Iteration 200  Error: 0.2563
 Iteration 250  Error: 0.2419
 Iteration 300  Error: 0.2244
 Iteration 350  Error: 0.2033
 Iteration 400  Error: 0.1847
 Iteration 450  Error: 0.1685
 Iteration 500  Error: 0.1488
PC 0.40270339066175864
Running permutation correlator for 500 iterations.
 Iteration 50  Error: 0.0048
 Iteration 100  Error: 0.0024
 Iteration 150  Error: 0.0000
 Iteration 200  Error: 0.0000
 Iteration 250  Error: 0.0000
 Terminating at iteration 289.
 No improvement for 100 iterations. Error: 0.0000
IC + PC 0.6999999131350116