Fix NICOS warnings (egammaAthenaPool-00-01-02)

Reconstruction/egamma/egammaAthenaPool/cmt/requirements

...ion/egamma/egammaAthenaPool/src/CaloRingsContainerCnv.cxx

...ction/egamma/egammaAthenaPool/src/CaloRingsContainerCnv.h

...tion/egamma/egammaAthenaPool/src/ElectronContainerCnv.cxx

...uction/egamma/egammaAthenaPool/src/ElectronContainerCnv.h

...uction/egamma/egammaAthenaPool/src/PhotonContainerCnv.cxx

...truction/egamma/egammaAthenaPool/src/PhotonContainerCnv.h

...tion/egamma/egammaAthenaPool/src/egDetailContainerCnv.cxx

...uction/egamma/egammaAthenaPool/src/egDetailContainerCnv.h

...uction/egamma/egammaAthenaPool/src/egammaContainerCnv.cxx

...truction/egamma/egammaAthenaPool/src/egammaContainerCnv.h

Reconstruction/egamma/egammaAthenaPool/src/egammaMsgUtil.h