added function to fit and plot points, and allows specification of energy range for fit. better handling of common and keyword args and made _plotCommon function relevant to class
added function to fit and plot points, and allows specification of energy range for fit. better handling of common and keyword args and made _plotCommon function relevant to class

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