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
Copy from master improvements in kdTreeTest + some changes in GofTest
from master: Add Anderson-Darling test for histograms. See ROOT-6069
Fix a -Wshadow warning