Implement a request from ATLAS: In addition to the existing function     virtual       TArrayD *GetSumw2()       {return &fSumw2;} provide also the const vesrion     virtual const TArrayD *GetSumw2() const {return &fSumw2;}
Implement a request from ATLAS:
In addition to the existing function
    virtual       TArrayD *GetSumw2()       {return &fSumw2;}
provide also the const vesrion
    virtual const TArrayD *GetSumw2() const {return &fSumw2;}


git-svn-id: acec3fd5b7ea1eb9e79d6329d318e8118ee2e14f@13713 27541ba8-7e3a-0410-8455-c3a389f83636

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