bugfix for Rapp19_Generator
add gp_background
gp_background: SN plot
updgrad ccsgp
gp_stack: portrait plot for LatestPatrickJieYi
gp_ptspec: add plots for LMR only
gp_ptspec: fix missing comma, larger bmargin in meanPtLMR
gp_rdiff/utils: adjust getMassRangesSums for systematic LMR ranges study
gp_rdiff: write all xfacs for LMR ranges to file
gp_rdiff: remove unecessary zeros from xfacs output
utils: customRanges & singleRange for getMassRangesSums
ptspec: LMR region, mean pt yr
gp_rdiff: excess plot update w/ dNdy, extension to BES-II