neutrons can be generated in water or lead shielding
energy deposition and photon response are saved
	modified:   include/NSDetectorConstruction.hh
	modified:   include/NSHit.hh
	modified:   include/NSPrimaryGeneratorAction.hh
	modified:   questions
	modified:   src/NSDetectorMessenger.cc
	modified:   src/NSEventAction.cc
	modified:   src/NSPrimaryGeneratorAction.cc
	modified:   src/NSRunAction.cc
	modified:   src/NSSD.cc
	modified:   todo
	modified:   vis.mac