addition changes to python binding generation

Core/CMakeLists.txt

Core/PythonAPI/libBornAgainCore.py

Core/PythonAPI/libBornAgainCore_wrap.cxx

Doc/Doxygen/DoxyfileSwig.in

.../python/fitting/ex07_FitAlongSlices/FitAlongSlices_new.py

Fit/CMakeLists.txt

Fit/PythonAPI/libBornAgainFit.py

Fit/PythonAPI/libBornAgainFit_wrap.cxx

Fit/PythonAPI/libBornAgainFit_wrap.h

dev-tools/swig/doxy2swig.py

dev-tools/swig/doxygen_core.i

dev-tools/swig/doxygen_fit.i

dev-tools/swig/extends.i

dev-tools/swig/libBornAgainCore.i

dev-tools/swig/libBornAgainFit.i