merge from trunk fix 48842 in computing limit
(see http://root.cern.ch/phpBB3/viewtopic.php?f=15&t=16164)


git-svn-id: https://root.cern.ch/svn/root/branches/v5-34-00-patches@48843 27541ba8-7e3a-0410-8455-c3a389f83636
  o ModelConfig
 
     - Add explicit sanity check (with printed error message in case of failure) in SetXXX() methods that take sets of parameters, e.g. SetNuisanceParameters(), SetPOI()
       that the supplied set of arguments contain genuine parameter objects only (i.e. RooAbsArg::isFundamental() return true on each)


git-svn-id: https://root.cern.ch/svn/root/branches/v5-34-00-patches@48844 27541ba8-7e3a-0410-8455-c3a389f83636