Fixobjectsyst

Change the implementation of the object systematics to take into account the different impacts on the various backgrounds and the signal.

The input becomes a bit more complicated as nested dictionaries are needed:

    pyfbu.objsyst = {
        'signal':{'jes':[0.05,0.05,0.05,0.05],
                  'jer':[0.03,0.03,0.03,0.03]
                  },
        'background':{
            'jes':{
                'bckg1':[0.05,0.05,0.05,0.05],
                'bckg2':[0.01,0.01,0.01,0.01]
                },
            'jer':{
                'bckg1':[0.01,0.01,0.01,0.01],
                'bckg2':[0.05,0.05,0.05,0.05]
                }
            }
        }