added properties for a list of mz intensities and intensity array that are summed mz/intensity pairs for use on the MZ axis.
added properties for a list of mz intensities and intensity array that are summed mz/intensity pairs for use on the MZ axis.

PNNL-Comp-Mass-Spec/Atreyu,PNNL-Comp-Mass-Spec/Atreyu,PNNL-Comp-Mass-Spec/Atreyu