Merge branch 'energy_dim' into 'master'

Documentation/Examples/cascade_example.cc

Documentation/Examples/stack_example.cc

Framework/Cascade/testCascade.cc

Framework/Particles/ParticleProperties.h

Framework/Particles/pdxml_reader.py

Framework/Particles/testParticles.cc

Framework/Units/PhysicalConstants.h

Framework/Units/PhysicalUnits.h

Framework/Units/testUnits.cc

Framework/Utilities/COMBoost.cc

Framework/Utilities/COMBoost.h

Framework/Utilities/testCOMBoost.cc

Processes/Sibyll/Decay.h

Processes/Sibyll/Interaction.h

Processes/Sibyll/SibStack.h

Processes/Sibyll/testSibyll.cc

Processes/StackInspector/StackInspector.cc

Processes/TrackingLine/testTrackingLine.cc

Stack/SuperStupidStack/SuperStupidStack.h

ThirdParty/phys/units/physical_constants.hpp