01-jul-2004 NvE AliCalorimeter derived from AliDevice to extend functionality (e...

01-jul-2004 NvE AliCalorimeter derived from AliDevice to extend functionality (e.g. allow definition
                of sets of calorimeters and investigate all the hits of a certain set via the
                AliEvent structure). To prevent matrix swapping restrictions, the memberfuctions
                SetSwapMode and GetSwapMode of AliCalorimeter have been renamed to SetMatrixSwapMode
                and GetMatrixSwapMode, respectively.
                Examples in the AliEvent.cxx documentation updated accordingly.
                Backward links reset for non-owned hits in AliDevice destructor.