merged tranjectory stuff

CMakeLists.txt

Framework/Geometry/BaseTrajectory.h

Framework/Geometry/CMakeLists.txt

Framework/Geometry/Helix.h

Framework/Geometry/LineTrajectory.h

Framework/Geometry/QuantityVector.h

Framework/Geometry/Sphere.h

Framework/Geometry/Trajectory.h

Framework/Geometry/testGeometry.cc

Framework/Particles/ParticleClassNames.xml

Framework/Particles/ParticleProperties.h

Framework/Particles/pdxml_reader.py

Framework/Particles/testParticles.cc

Framework/Units/PhysicalConstants.h

Framework/Units/PhysicalUnits.h