Removed hardcoded loading of G4_Gd. Added support to fall back to GEANT4 NIST database for elements and materials. Replaced G4cout by the internal logging mechanisms in Materials.cc.
Removed hardcoded loading of G4_Gd.
Added support to fall back to GEANT4 NIST database for elements and materials.
Replaced G4cout by the internal logging mechanisms in Materials.cc.

BenLand100/rat-pac,mastbaum/rat-pac,BenLand100/rat-pac,BenLand100/rat-pac,BenLand100/rat-pac,mastbaum/rat-pac,BenLand100/rat-pac,mastbaum/rat-pac,mastbaum/rat-pac,mastbaum/rat-pac