[surrogate][SeqDesign] added new feature to compare the likelihood distribution with that of the provided refrence.

[surrogate] implemented the sampling methods of chaospy and added new implementation of orthogonal polynomials based on uqlab.

[surrogate,bayes,tests] modified Fetzer test and modified the likelihood caluclations for both surrogate and bayes for multiple outputs.

[surrogate] added active learning schemes (ALM and ALC) and seperated Exploration and Exploitation methods.

[surrogate] adapted LOOCV error to the type of RegMethod. Now it uses clf.predict to compute residuals