in form factor context, prefer ff over form_factor

Sample/Scattering/FormFactorBAPol.cpp

Sample/Scattering/FormFactorBAPol.h

Sample/Scattering/FormFactorDWBA.cpp

Sample/Scattering/FormFactorDWBA.h

Sample/Scattering/FormFactorDWBAPol.cpp

Sample/Scattering/FormFactorDWBAPol.h

Sample/Scattering/FormFactorDecoratorMaterial.cpp

Sample/Scattering/FormFactorDecoratorMaterial.h

Sample/Scattering/FormFactorDecoratorPositionFactor.cpp

Sample/Scattering/FormFactorDecoratorPositionFactor.h

Sample/Scattering/FormFactorDecoratorRotation.cpp

Sample/Scattering/FormFactorDecoratorRotation.h

Sample/Scattering/IFormFactorDecorator.h

auto/Wrap/doxygenSample.i