Much improved G4mplEquationSetup - simpler and less churn
G4mplEquationSetup
1) Create a ChordFinder only in InitializeForField
2) Recall the 'original' ChordFinder for use of regular charged
particles (and to reinstate it in the FieldMgr at end of stepping)
G4mplAtlasTransportation: adapted to changes above.
The above changes from @japost should finally fix ATLASSIM-6019 and related tickets.
Edited by John Derek Chapman