Added IParticle::createSlicedParticle (DOES NOT BUILD!)

Core/Particle/IParticle.cpp

Core/Particle/IParticle.h

Core/Particle/Particle.cpp

Core/Particle/Particle.h

Core/Particle/SlicedParticle.h

Wrap/swig/ignores.i

Wrap/swig/libBornAgainCore.i

auto/Wrap/doxygen_core.i

auto/Wrap/libBornAgainCore.py

auto/Wrap/libBornAgainCore_wrap.cpp