[tes5] Start Python functional test of automatic slicing ()

Tests/Functional/Consistence/ConsistenceTests.cpp

Tests/Functional/Fitting/FitTests.cpp

Tests/Functional/LibFit/MinimizerTests.cpp

Tests/Py/Functional/slicing.py

Tests/Unit/GUI/TestDetectorItems.cpp

Tests/Unit/GUI/TestFitParameterModel.cpp

Tests/Unit/GUI/TestFormFactorItems.cpp

Tests/Unit/GUI/TestHelpers.cpp

Tests/Unit/GUI/TestInstrumentItems.cpp

Tests/Unit/GUI/TestLinkInstrument.cpp

Tests/Unit/GUI/TestMaterialItems.cpp

Tests/Unit/GUI/TestProfileItems.cpp

Tests/Unit/GUI/TestRealDataModel.cpp

Tests/Unit/GUI/TestScientificSpinBox.cpp

Tests/Unit/GUI/TestSessionItem.cpp

Tests/Unit/GUI/TestSessionItemData.cpp

Tests/Unit/GUI/TestSessionItemUtils.cpp

Tests/Unit/GUI/TestSessionModel.cpp

Tests/Unit/GUI/TestSessionXML.cpp

Tests/Unit/GUI/TestUpdateTimer.cpp