adding different normalization styles to AmpSumIntensity; adding
functions to Amplitudes to seperatly return Amplitude and WignerD value;
adding new class DalitzEfficiency for efficiency correction, therefore
we need to introduce again a root dependency because we want to use
TEfficiency; separating physics constant to new file physConstants.xml
Merge branch 'master' of github:MathiasMichel/ComPWA.git