*****************************************************************************
  *** Improve robustness of likelihood offsetting feature                   ***
  *****************************************************************************

  o RooAbsTestStatistic

    - Remove code that adds back likelihoood offset in evaluate() 


  o RooAbsReal

    - Insert code to add back likelihood offset here in return value getValV() 
      but fill _value cache always with offsetted values

  o RooAbsAbsOptTestStatistics

    - In combinedValue() explicitly call getValV() instead of getVal()
      to eliminate short-cut cache-return strategy. Calls to getValV()
      will still return cached value but will add likelihood offset as
      necessary to return value


git-svn-id: https://root.cern.ch/svn/root/branches/v5-34-00-patches@49074 27541ba8-7e3a-0410-8455-c3a389f83636