Update file headers

Core/Multilayer/ISpecularStrategy.h

Core/Multilayer/RoughnessModels.cpp

Core/Multilayer/RoughnessModels.h

Core/Multilayer/SpecularMagneticOldStrategy.cpp

Core/Multilayer/SpecularMagneticOldStrategy.h

Core/Multilayer/SpecularMagneticStrategy.cpp

Core/Multilayer/SpecularMagneticStrategy.h

Core/Multilayer/SpecularScalarNCStrategy.cpp

Core/Multilayer/SpecularScalarNCStrategy.h

Core/Multilayer/SpecularScalarStrategy.cpp

Core/Multilayer/SpecularScalarStrategy.h

Core/Multilayer/SpecularScalarTanhStrategy.cpp

Core/Multilayer/SpecularScalarTanhStrategy.h

Core/Multilayer/SpecularStrategyBuilder.cpp

Core/Multilayer/SpecularStrategyBuilder.h