to prevent long output lists when many devices (and/or tracks) are present.
New memberfunction ShowTracks introduced in AliJet and memberfunction Data() updated.
18-apr-2005 NvE New memberfunction GetTracks introduced in AliJet to provide various track selections.
+19-apr-2005 NvE Memberfunctions GetNtracks and GetTracks of AliJet extended in functionality.