Implemented more accurate beta spectrum

CMakeLists.txt

analysis/VKAdd

analysis/include/VKBaseData.hh

analysis/include/VKPileupData.hh

analysis/include/VKSimData.hh

analysis/include/VKSummingData.hh

analysis/loop.sh

analysis/main.cpp

analysis/src/VKBaseData.cpp

analysis/src/VKPileupData.cpp

analysis/src/VKSimData.cpp

analysis/src/VKSummingData.cpp

cmake/FindGSL.cmake

include/VKBetaSpectrum.hh

include/VKCatcherFoil.hh

include/VKDetectorConstruction.hh

include/VKDetectorMessenger.hh

include/VKPrimaryGeneratorAction.hh

include/VKPrimaryGeneratorMessenger.hh

mac/allowed.mac