Commits on Mar 5, 2018

1. Fix #413: limit vacuum step size in magnetic field …

   Adjust the charged particle step routine for transport in vacuum when
   there is an electromagnetic field (emf). The existing logic failed
   because the emf step size restriction was not taken into account before
   the howfar call. Hence the howfar method tracked the particle in a
   single straight step across the entire vacuum region, causing erroneous
   region changes and discards.
   
   Also check if the particle in fact entered a new region before calling
   the macro to change the region, since charged particle may take many
   steps through a vacuum region when there is a field.
   
   Remove redundant step size restriction code in the vacuum emf transport
   macro, now that the field step size restriction in vacuum has been moved
   ahead of howfar in the electr subroutine.

   

   ftessier committed Mar 5, 2018
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