Add SM inputs w/ extra templates for systematics

  - Just 7TeV for now, 8TeV to follow
  - Added shapes for CMS_eff_b, CMS_fake_b, CMS_scale_j
  - Also added scripts to dump list of yield uncertainties, e.g.

 ./printSystematic.py -i htt_et.inputs-sm-7TeV-syst.root -s CMS_eff_b_7TeV -p W,QCD,ZL,ZJ,TT,VV,ggH125,qqH125,VH125