It's nicer than the "classic" namespace.

modified:   src/Algorithms/BeamBeam3D.cpp
modified:   src/Algorithms/BeamBeam3D.h
modified:   src/Algorithms/MPSplitIntegrator.cpp
modified:   src/Algorithms/MPSplitIntegrator.h
modified:   src/Algorithms/ThickTracker.cpp
modified:   src/Algorithms/bet/EnvelopeBunch.cpp
modified:   src/Algorithms/bet/EnvelopeBunch.h
modified:   src/Classic/AbsBeamline/Integrator.h
modified:   src/Classic/Algorithms/CMakeLists.txt
modified:   src/Classic/Algorithms/MapIntegrator.cpp
modified:   src/Classic/Algorithms/MapIntegrator.h
renamed:    src/Classic/Algorithms/Particle.cpp -> src/Classic/Algorithms/OpalParticle.cpp
renamed:    src/Classic/Algorithms/Particle.h -> src/Classic/Algorithms/OpalParticle.h
modified:   src/Classic/Algorithms/OrbitTracker.cpp
modified:   src/Classic/Algorithms/PartBunch.cpp
modified:   src/Classic/Algorithms/PartBunch.h
modified:   src/Classic/Algorithms/ThinTracker.cpp
modified:   src/Classic/Algorithms/Tracker.cpp
modified:   src/Classic/Algorithms/Tracker.h
modified:   src/Track/TrackSave.cpp
modified:   src/Track/TrackStart.cpp