Draft: Adjusting range of DeltaE histograms in egamma ART
This commit adjusts the range of distributions of the shower shape variable DeltaE within egamma ART tests such that the x-axis and the values that are filled into the histograms relate better to each other. So far, the x-axis range of DeltaE distributions within egamma ART tests were set up to be filled with values given in GeV although they were filled with values given in MeV.