Allow quasi-stable particle simulation to be used outside of ISF
- Add
AtlasG4_QS
simulator and allow it to be configured on theAtlasG4_tf.py
command-line - Enable quasi-stable particle simulation with
G4AtlasAlg
(used byAtlasG4_tf.py
) - Add a test for AtlasG4_QS configuration
This MR does not affect any production configurations of simulation.