Add the following new functions:

  virtual Int_t   ReadTObject(TObject *obj, const char *keyname);
  virtual Int_t   WriteTObject(const TObject *obj, const char *name=0, Option_t *option="");

Add an optional argument bufsize in the following functions
  virtual Int_t   Write(const char *name=0, Int_t opt=0, Int_t bufsize=0);
  virtual Int_t   Write(const char *name=0, Int_t opt=0, Int_t bufsize=0) const ;
  virtual Int_t   WriteObjectAny(const void *obj, const char *classname, const char *name, Option_t *option="", Int_t bufsize=0);
  virtual Int_t   WriteObjectAny(const void *obj, const TClass *cl, const char *name, Option_t *option="", Int_t bufsize=0);

Add the following static member
  static Bool_t fgAddDirectory;   //!flag to add histograms, graphs,etc to the directory
and the functions
  static  void     AddDirectory(Bool_t add=kTRUE);
    // Sets the flag controlling the automatic add objects like histograms, TGraph2D, etc
    // in memory
    //
    // By default (fAddDirectory = kTRUE), these objects are automatically added
    // to the list of objects in memory.
    // Note that in the classes like TH1, TGraph2D supporting this facility,
    // one object can be removed from its support directory
    // by calling object->SetDirectory(0) or object->SetDirectory(dir) to add it
    // to the list of objects in the directory dir.
    //
    //  NOTE that this is a static function. To call it, use;
    //     TDirectory::AddDirectory

  static  Bool_t   AddDirectoryStatus();
    // static function: see TDirectory::AddDirectory for more comments

 These two functions are good alternatives to the same functions in TH1.
 The functions in TH1 are still kept for back compatibility.


git-svn-id: http://root.cern.ch/svn/root/trunk@17527 27541ba8-7e3a-0410-8455-c3a389f83636