[surrogate][SeqDesign] added the feature for validation error for each iteration.

BayesValidRox/PostProcessing/PostProcessing.py

BayesValidRox/surrogate_models/surrogate_models.py

BayesValidRox/tests/AnalyticalFunction/AnalyticalFunction.py

...idRox/tests/AnalyticalFunction/AnalyticalFunction_Test.py

BayesValidRox/tests/AnalyticalFunction/Prior.npy

BayesValidRox/tests/AnalyticalFunction/origModelOutput.npy

BayesValidRox/tests/Co2BenchmarkTest/Prior.npy

BayesValidRox/tests/Co2BenchmarkTest/Test_CO2Benchmark.py

BayesValidRox/tests/Co2BenchmarkTest/origModelOutput.npy

...nchmarkTest/uqBenchmarkData/PosteriorGeneration/Prior.npy

...t/uqBenchmarkData/PosteriorGeneration/origModelOutput.npy