when the value is used as 'half-length'
replacing GetNegativeEndZ by GetPositiveEndZ fixes the problem
because GetPositiveEndZ is the user value that corresponds to half-length

LCIO now exports LCIO::lcio, so we could use that if LCIO is new enough

Explicity set namespace to TrackClassification in
TestStackingAction::classifyNewTrack

Co-authored-by: Andre Sailer <andre.philippe.sailer@cern.ch>

Co-authored-by: Andre Sailer <andre.philippe.sailer@cern.ch>

Co-authored-by: Andre Sailer <andre.philippe.sailer@cern.ch>

Remove support for very old versions of ROOT < 6.26.0. Remove default use of std namespace from some implementation files.

Geant4InputHandling: prevent adding same particle more than once

Geant4InputHandling: collectPrimaries: use the mask to place the daughter vertices rather than size of the map

Now every place where interaction->vertices map is being used, the mask is used as the key to the map, instead of something else