Add a complete documentation of the histogramming package in the implementation header. Add new member functions to add, multiply or divide an histogram with a function:     virtual void     Add(TF1 *h1, Double_t c1=1);     virtual void     Divide(TF1 *h1, Double_t c1=1);     virtual void     Multiply(TF1 *h1, Double_t c1=1);
Add a complete documentation of the histogramming package in the
implementation header.
Add new member functions to add, multiply or divide an histogram
with a function:
    virtual void     Add(TF1 *h1, Double_t c1=1);
    virtual void     Divide(TF1 *h1, Double_t c1=1);
    virtual void     Multiply(TF1 *h1, Double_t c1=1);


git-svn-id: acec3fd5b7ea1eb9e79d6329d318e8118ee2e14f@456 27541ba8-7e3a-0410-8455-c3a389f83636

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