New Python unittest for testing IntensityData from CMake, all py examples/tests are adjusted for new getIntensityData()

Completed creation of mess form factor that supports polarized calculations; refactor: remove spaces before public, protected, private

Moved to LayerSpecularInfo for polarized calculations (removed MagneticCoefficientsMap completely); Xcode project adapted

- 3rd person form: "Does" this or that.
- For all const methods that return something: "Returns" ...
- For boolean return value: "Returns true if " ...

Insert new header comment block, remove old one, manually improve file comments (defines / implements), change brief function description to doxygen format, remove some outcommented code

FitSuiteObject::setExperimentNormalize is now True by default, bug in Mask with non-explicit constructor, bug in Experiment::setDetector with missed Mask, new sub example in TestFittingModule2