Add a new tutorial illustrating how to:   -create a variable binwidth histogram with a binning such    that the population per bin is about the same.   -rebin a variable binwidth histogram into another one.
Add a new tutorial illustrating how to:
  -create a variable binwidth histogram with a binning such
   that the population per bin is about the same.
  -rebin a variable binwidth histogram into another one.


git-svn-id: ecbadac9c76e8cf640a0bca86f6bd796c98521e3@29921 27541ba8-7e3a-0410-8455-c3a389f83636

bbannier/ROOT,dawehner/root,dawehner/root,bbannier/ROOT,bbannier/ROOT,bbannier/ROOT,bbannier/ROOT,bbannier/ROOT,dawehner/root,dawehner/root,dawehner/root,dawehner/root,dawehner/root,dawehner/root,bbannier/ROOT