Bernsten ref now has p0 fixed to 1e-6
Merge branch 'master' into bernFixAParam

Merging in fix to chi^2 calculation when params are fixed
in RooModelPlotter
Added code to save data and fit curves in RooModelPlotter

  also added singleUseScripts/comparePullPlots.py to compare them
bkgPlotter.py now shows diff between fits

  through improved RooCompareModels
bkgPlotter.py: pull hist comparisons
Merge branch 'master' into bernFixAParam

  merge in updated fitBiasStudy.py debugging
  output into bernFixAParam