cld_steer: use tracking volume

[Zehvogel]

BEGINRELEASENOTES

• Use Geant4TVUserParticleHandler by default in cld_steer.py

ENDRELEASENOTES

Now that the default is CLD_o2_v07 we can also default to the particle handler that uses the custom tracking region instead of just a cylinder.

[Zehvogel]

The broken test is ddsim_cld_arc but that one uses its own ddsim steering file which I did not touch. @atolosadelgado can you take a look?

[Zehvogel]

Ah never mind, cld_arc_steer.py imports everything, so we need to change back to Geant4TVUserParticleHandler there explicitly... But then we also need to set all the other SIM.part options again?

[atolosadelgado]

Ah never mind, cld_arc_steer.py imports everything, so we need to change back to Geant4TVUserParticleHandler there explicitly... But then we also need to set all the other SIM.part options again?

Hi! Thanks for checking it! If it is a problem how cld steer file is loaded into cld_arc_steer file, I can investigate an alternative to this, what do you think?

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edit: sorry I saw your commit after I wrote this comment, thanks for fixing it! :)