call setPolarization from ISimulation

Examples/scatter2d/MagneticSpheres.py

Examples/specular/BasicPolarizedReflectometry.py

Examples/specular/PolarizedNoAnalyzer.py

Examples/specular/PolarizedNonperfectAnalyzerPolarizer.py

Examples/specular/PolarizedSpinAsymmetry.py

Examples/specular/PolarizedSpinFlip.py

Sim/Simulation/ISimulation.cpp

Sim/Simulation/ISimulation.h

Tests/Functional/Suite/MakeSimulations.cpp

Tests/Unit/Sim/SpecularSimulationTest.cpp

auto/Wrap/doxygenDevice.i

auto/Wrap/doxygenSim.i

auto/Wrap/libBornAgainSim.py

auto/Wrap/libBornAgainSim_wrap.cpp