Form factors: addition of appendix to User Manual, schematic views and missing information to Doxygen

Conflicts:
	Core/PythonAPI/src/PythonModule.cpp
	Fit/PythonAPI/src/ISquaredFunction.pypp.cpp
	Fit/PythonAPI/src/PythonModule.cpp
	Fit/PythonAPI/src/SquaredFunctionDefault.pypp.cpp
	Fit/PythonAPI/src/SquaredFunctionWhichOnlyWorks.pypp.cpp
	Fit/PythonAPI/src/SquaredFunctionWithGaussianError.pypp.cpp
	Fit/PythonAPI/src/SquaredFunctionWithSystematicError.pypp.cpp

Regenerated IsGISAXS08 functional test references to take care of previous instabilities in 2d paracrystal interference function

Bugfix in OutputDataIterator to have masked areas in multi threaded environment, corresponding unit test.

1. HomogeneousMaterial test
2. HomogeneousMagneticMaterial test