Include exclusive cross-section information

Issue: any analyses using non-data-driven methods for background estimation need exclusive cross section information, but the current table only include total cross-section.

Aim: incorporate exclusive cross-section information from xml file to the table.

Link the presenation I gave at Simulation Developments meeting: https://indico.cern.ch/event/1369664/contributions/5771437/attachments/2786502/4858433/SIMSTAT.pdf