Merge pull request #519 from gpospelov/develop

...ultaneousFitOfTwoDatasets/SimultaneousFitOfTwoDatasets.py

...ation/ex03_InterferenceFunctions/Interference1DLattice.py

...mulation/ex03_InterferenceFunctions/RectangularGrating.py

GUI/coregui/Views/widgetbox/images/Lattice2DFinite.png

GUI/coregui/Views/widgetbox/widgetbox.qrc

GUI/coregui/Views/widgetbox/widgetbox.xml

Tests/Functional/Python/PyPersistence/CMakeLists.txt

Tests/ReferenceData/Python/Interference1DLattice.ref.int.gz

Tests/ReferenceData/Python/RectangularGrating.ref.int.gz

dev-tools/code-tools/update-website.py