Cleanup in basic fitting tutorials.

...hon/fitting/ex02_FitBasics/FitCylindersInSquareLattice.py

...fitting/ex02_FitBasics/FitCylindersInSquareLattice_new.py

Examples/python/fitting/ex02_FitBasics/FitCylindersPrisms.py

...hon/fitting/ex02_FitBasics/FitCylindersPrisms_detailed.py

...s/python/fitting/ex02_FitBasics/FitCylindersPrisms_new.py

...s/python/fitting/ex02_FitBasics/basic_fitting_tutorial.py

...fitting/ex02_FitBasics/basic_fitting_tutorial_data.txt.gz

...n/fitting/ex02_FitBasics/refdata_fitcylinderprisms.int.gz