make the default retvalue 'lowedge' for buildBinningFromTbl()
make the default retvalue 'lowedge' for buildBinningFromTbl()

alphatwirl/alphatwirl,TaiSakuma/AlphaTwirl,alphatwirl/alphatwirl,TaiSakuma/AlphaTwirl,alphatwirl/alphatwirl,alphatwirl/alphatwirl