29-jun-2004 NvE New class AliDevice introduced.
New memberfunctions and datamembers introduced in AliEvent to support investigation
and ordering of hits of various (classes of) devices.
+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.