New clipping functionality in IntensityDataFunctions.

Core/PythonAPI/src/ConstKBinAxis.pypp.cpp

Core/PythonAPI/src/CustomBinAxis.pypp.cpp

Core/PythonAPI/src/FixedBinAxis.pypp.cpp

Core/PythonAPI/src/IAxis.pypp.cpp

Core/PythonAPI/src/IntensityData.pypp.cpp

Core/PythonAPI/src/IntensityDataFunctions.pypp.cpp

Core/PythonAPI/src/InterferenceFunction2DLattice.pypp.cpp

Core/PythonAPI/src/VariableBinAxis.pypp.cpp

Core/Tools/inc/IAxis.h

Core/Tools/inc/OutputData.h

Core/Tools/src/IntensityDataFunctions.cpp

Tests/UnitTests/TestCore/IntensityDataFunctionsTest.h

Tests/UnitTests/TestCore/main.cpp