added empty selection, for looking at signal region skim
set it up to run the channels necessary for the full ABCD QCD estimate
added a few lines so it will work with makeSignalRegionYieldsTable.py.  also set it to just produce the Background sample, to be used in the ABCD QCD method
first commit of a config file to be used with runQCDEstimate.py
first commit of a script to run the full ABCD QCD method