cleanup SUSYBSMAnalysis repository

In the course of updating the HSCP analysis code located in the SUSYBSMAnalysis,
I have done some cleaning of the files in this directory.
Basically I deleted SUSYBSMAnalysis/Configuration and SUSYBSMAnalysis/Skimming that are deprecated since a very long time  (CSA08 IIRC).  I've got a mail asking me wether these files are still in used recently, so I guess it could be safely removed.

Note that SUSYBSMAnalysis/Skimming/pluggins are still used by the HSCP skim (to be updated for Run2),
so I basically displaced all this files into SUSYBSMAnalysis/HSCP/pluggins/