Removed obsolete classes.

objectstore/GenericObject.cpp

objectstore/cta.proto

scheduler/ArchiveRequest.cpp

scheduler/ArchiveRequest.hpp

scheduler/CMakeLists.txt

scheduler/OStoreDB/OStoreDB.cpp

scheduler/RetrieveToFileRequest.cpp

scheduler/RetrieveToFileRequest.hpp

scheduler/SchedulerDatabase.hpp

scheduler/SchedulerDatabaseTest.cpp

scheduler/UserArchiveRequest.cpp

scheduler/UserArchiveRequest.hpp

scheduler/UserRequest.cpp

scheduler/UserRequest.hpp

scheduler/UserRetrieveRequest.cpp

scheduler/UserRetrieveRequest.hpp