Added attribute to allow selection of cone isolation for the SOS Analysis needs.

Added an option in ttHLepAnalyzerSusy.py to allow the usage of lepton isolation
defined in a cone 0.4 (for the SOS Analysis needs).
This lepton isolation is selected with an attribute defined in the "susySoftlepton_cfg.py"
file. Other users will continue to use the lepton isolation defined in a cone 0.3