pass arg by reference, get rid of pointless std::move

Sample/Particle/FormFactorCoreShell.cpp

Sample/Particle/FormFactorCoreShell.h

Sample/Particle/FormFactorCrystal.h

Sample/Particle/FormFactorWeighted.cpp

Sample/Particle/FormFactorWeighted.h

Sample/Scattering/FormFactorBAPol.h

Sample/Scattering/FormFactorDWBA.h

Sample/Scattering/FormFactorDWBAPol.h

Sample/Scattering/FormFactorDecoratorMaterial.cpp

Sample/Scattering/FormFactorDecoratorMaterial.h

Sample/Scattering/IFormFactor.h

Sample/Scattering/IFormFactorBorn.h

Sample/Scattering/IFormFactorDecorator.h

auto/Wrap/doxygenDevice.i

auto/Wrap/doxygenSample.i

auto/Wrap/libBornAgainSample.py

auto/Wrap/libBornAgainSample_wrap.cpp

auto/Wrap/libBornAgainSample_wrap.h