[pola01] Align polarization with PhysRef; simplify and unify API and GUI ()

Device/Detector/IDetector.cpp

Device/Detector/IDetector.h

Device/Detector/OffspecDetector.cpp

Device/Detector/OffspecDetector.h

Device/Pol/PolFilter.cpp

Device/Pol/PolFilter.h

Examples/scatter2d/MagneticCylinders2.py

Examples/scatter2d/MagneticSpheres.py

Examples/scatter2d/PolarizedSANS.py

Examples/specular/MagneticLayer.py

Examples/specular/MagneticLayerImperfect.py

Examples/specular/PolarizedSpinAsymmetry.py

GUI/Model/Device/InstrumentItems.cpp

GUI/Model/Device/InstrumentItems.h

GUI/Model/FromCore/ItemizeSimulation.cpp

GUI/Model/Model/ParameterTreeUtil.cpp

GUI/View/Instrument/PolarizationAnalysisEditor.cpp

GUI/View/Instrument/PolarizationAnalysisEditor.h

Sample/Particle/PolyhedralUtil.h

Sim/Computation/SpecularComputation.cpp