privatize Particle::setFormFactor

GUI/coregui/Models/MesoCrystalItem.cpp

GUI/coregui/Models/ParticleItem.cpp

GUI/coregui/Views/RealSpaceWidgets/RealSpaceBuilderUtils.cpp

Sample/Particle/Particle.cpp

Sample/Particle/Particle.h

Tests/UnitTests/Core/Sample/ParticleCompositionTest.cpp

Tests/UnitTests/Core/Sample/ParticleCoreShellTest.cpp

Tests/UnitTests/Core/Sample/ParticleLayoutTest.cpp

Tests/UnitTests/Core/Sample/ParticleTest.cpp

Wrap/swig/fromBase.i

Wrap/swig/libBornAgainSample.i

auto/Wrap/doxygenSample.i

auto/Wrap/libBornAgainSample.py

auto/Wrap/libBornAgainSample_wrap.cpp