new version of tutorial with:

 - fixed treatment of nuisance prior when using HybridCalculator by adding the  possibility 
  for user to pass the name of the nuisance pdf

- add extra parameter useNumberCounting for number counting events


git-svn-id: http://root.cern.ch/svn/root/trunk@40297 27541ba8-7e3a-0410-8455-c3a389f83636