From Wouter: new version of RooChebyshev which support the possibility to define a reference range for the evaluation and normalisation of the polynomial. This fixes the problem observed fitting in 2 distinct ranges, ROOT-6664
initialise data member in default constructor
Speed up tutorial by plotting the posterior in less points (20 instead of 50)
Disable PROOF for these tutorials
Initialize some variables
Try to fix test for ubuntu. Add drawing of graph as an option
Add Anderson-Darling test for histograms. See ROOT-6069
Fix a -Wshadow warning