New Geant4 tag created on top of tag v10.6.3.4. Differences w.r.t. v10.6.3.4: - Make more robust the Woodcock implementation when particles leave the Woodcock region - Let the Transportation to take over when a track is stuck in a Woodcock region This should fix https://its.cern.ch/jira/browse/ATLASSIM-6364 and https://its.cern.ch/jira/browse/ATLASSIM-6365 - Patch to the Bertini cascade - final fix to ATLASSIM-6363 - Patch to Woodcock tracking - more robust against geometry clashes - final fix to ATLASSIM-6396