first simple version of energy loss

Documentation/Examples/CMakeLists.txt

Documentation/Examples/cascade_example.cc

Environment/DensityFunction.h

Environment/InhomogeneousMedium.h

Environment/LinearApproximationIntegrator.h

Framework/Geometry/Trajectory.h

Framework/Geometry/Vector.h

Framework/Particles/ParticleProperties.h

Framework/Particles/pdxml_reader.py

Framework/Particles/testParticles.cc

Framework/Units/PhysicalUnits.h

Processes/CMakeLists.txt

Processes/EnergyLoss/CMakeLists.txt

Processes/EnergyLoss/EnergyLoss.cc

Processes/EnergyLoss/EnergyLoss.h

Processes/HadronicElasticModel/HadronicElasticModel.h

Stack/NuclearStackExtension/NuclearStackExtension.h

Stack/SuperStupidStack/SuperStupidStack.h