ElectronPhotonSelectorTools cppcheck warnings.
requested to merge ATLAS-EGamma/athena:TForwardElectronIsEMSelector_cppcheck_function_order_diff into master
ElectronPhotonSelectorTools cppcheck warnings.
- rm unused calcIsEm,
- fix arguement order in calocuts_electrons ,
- rm redundant check (done already in the outer if)