[WIP] Updating cross-sections of processes for both 7 TeV and 8 TeV; updati… n...

...g bash and python scripts for 7 TeV running for samples recently made available.
THIS IS WRONG! Please keep the old value of  36257.2 (the 12234 value from the twiki is just for W->lv, l=muon). Please change them for W+Jets systematic samples as well.