[ExpDesign] fixed the special case of lognormal distribution and fixed the Beam tese.

BayesValidRox/surrogate_models/ExpDesigns.py

BayesValidRox/surrogate_models/surrogate_models.py

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

BayesValidRox/tests/BeamTest/SSBeam_Deflection.inp

BayesValidRox/tests/BeamTest/Test_Beam.py

BayesValidRox/tests/BeamTest/myBeam9points

BayesValidRox/tests/BeamTest/myBeam9points.cpp