Tag to be used with the master branch of atlas/athena. Update(s) since 2.0.95: - Switched to building all GeoModel libraries from the "new" GeoModel mono-repository; - Upgraded CLHEP to version 2.4.1.3; - Upgraded Geant4 to version 10.6.3.2; - Tweaked the linking options on the aarch64 platform.