Detector resolution function (step 1) + fixed some compiler warnings

App/App.pro

App/inc/TestDetectorResolution.h

App/inc/TestIsGISAXS1.h

App/inc/TestIsGISAXS10.h

App/inc/TestIsGISAXS3.h

App/src/TestDetectorResolution.cpp

App/src/TestFactory.cpp

App/src/TestIsGISAXS1.cpp

App/src/TestIsGISAXS10.cpp

App/src/TestIsGISAXS3.cpp

App/src/TestIsGISAXS9.cpp

Core/Algorithms/inc/ConvolutionDetectorResolution.h

Core/Algorithms/inc/Detector.h

Core/Algorithms/inc/GISASExperiment.h

Core/Algorithms/inc/IDetectorResolution.h

Core/Algorithms/src/ConvolutionDetectorResolution.cpp

Core/Algorithms/src/Detector.cpp

Core/Algorithms/src/GISASExperiment.cpp

Core/Core.pro

Core/Tools/inc/MathFunctions.h