first round of cleanup of macros -- potentially the legend still has to ...

...be moved a bit to the right and mm might drop the WJets template
- cleaned up sample hist.
- added consistent event category labels.
- move Fit/Prefit --> Postfit/Prefit in ratio plots.
- cross checked normalization of templates and proper filling in samples histograms.
- adjusted Ndivisions and axis range for Postfit/Prefit plot.
- removed old commented code.
- removed special treatment of lumi in 8TeV samples for MSSM, which is obsolete (after check with Felix).