added notebook example for extracting spectral points and fit parameters from a stage 6 root file
added notebook example for extracting spectral points and fit parameters from a stage 6 root file

mbuchove/analysis-tools-m,mbuchove/analysis-tools-m,mbuchove/analysis-tools-m,mbuchove/analysis-tools-m,mbuchove/analysis-tools-m,mbuchove/analysis-tools-m