FitObject refactored to get rid from ChiSquared module

App/src/FitSuiteDrawObserver.cpp

App/src/TestIsGISAXS12.cpp

App/src/TestIsGISAXS13.cpp

App/src/TestIsGISAXS5.cpp

Core/Algorithms/inc/FitElement.h

Core/Algorithms/src/FitElement.cpp

Examples/python/fitting/ex05_FitWithMasks/FitWithMasks.py

Fit/FitKernel/inc/FitObject.h

Fit/FitKernel/inc/FitSuite.h

Fit/FitKernel/inc/FitSuiteObjects.h

Fit/FitKernel/src/FitObject.cpp

Fit/FitKernel/src/FitSuite.cpp

Fit/FitKernel/src/FitSuiteObjects.cpp

Fit/PythonAPI/src/FitObject.pypp.cpp

Fit/PythonAPI/src/FitSuite.pypp.cpp

Fit/PythonAPI/src/FitSuiteObjects.pypp.cpp