Tracking with Radiation in PTC

PTC can track with radiation in 3 complementary modes:

1. Classical radiation can be turned on the state Radiation2.9.1.
2. The equilibrium beams sizes are computed using the state Envelope 2.9.2.The 3 Chao equilibrium ``emittances'' are extracted.
3. One can also track with a real stochastic kick using the State Stochastic.2.9.3

Only the routines action on a NODE_LAYOUT can handle radiation: 4.2.5, 4.2.6, 4.2.9