Changed the definition of fillCutFlow so that it takes in two parameters: the
global weight and the channel weight that is only applied to the last bin. Both
are one by default.
Moved the definition of the default value of the parameter to the "at" function
to the correct place.
Factored eventScaleFactor_ into globalScaleFactor_ and channelScaleFactor_,
which includes event-wide and object-dependent contributions, respectively.
Only globalScaleFactor_ is applied in cutflow histograms, except for the last
bin which is now the fully weighted event yield.
Declared globalScaleFactor_ and channelScaleFactor_.
Every cutflow histogram now has one extra bin at the end to which a separate
weight can be applied when filling.
Moved the definition of the default value of the parameter to the "at" function
to the correct place.
Added histograms for globalScaleFactor_ and channelScaleFactor_.