Migrate classes using local definitions of SUSY Particles to use TruthUtils

A number of simulation classes related to R-Hadrons and stopped particle simulation defined their own isSUSYParticle methods which returned true for a somewhat arbitrary sub-set of sparticle pdg_id values. These methods have been replaced by calls to the more robust helper functions from TruthUtils/AtlasPID.h. Small changes in output are possible for SUSY simulation jobs using these classes as previously missed information may now be recorded.