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PreStepPoint quantities in StepHistogramTool

As discussed with Geant4 authors, @jchapman, and @hgray, it makes more sense to use the "PreStepPoint" instead of "PostStepPoint" for the following variables:

  • kinetic energy in current step,
  • volume of the current step,
  • step position.

For the process corresponding to the current step "PostStepPoint" remains to be used. I also added kinetic energy at the end of the step (using the "PostStepPoint") because it adds some interesting info. This is how it was calculated before, but I did not want to completely remove it, so now we have both pre- and post-step kinetic energy.

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