Added possibility to use mu- (or other particles) as the primary particles
in the G4ParticleGun (this option can be switched on by
/gun/primaryparticle ).
This is the first version of the muSR simulation code (musrSim)
based on the merged codes of Kamil Sedlak and Toni Shiroka.
It should be a running version of the simulation code, however
it has not been very well tested, therefore it will probably
need some further development.
