Added fixing ratio of params in ParameterPool + fixed compilation warnings in Xcode

App/inc/ROOTGSLNLSMinimizer.h

App/inc/ROOTMinimizerFunction.h

App/src/FitSuiteHelper.cpp

App/src/ROOTGSLNLSMinimizer.cpp

App/src/ROOTMinimizer.cpp

App/src/StandardSamples.cpp

App/src/TestFormFactors.cpp

...ithms/src/SizeSpacingCorrelationApproximationStrategy.cpp

Core/FormFactors/inc/FormFactorCylinder.h

Core/FormFactors/inc/IFormFactor.h

Core/Samples/src/ParticleDecoration.cpp

Core/Tools/inc/IMinimizer.h

Core/Tools/inc/ParameterPool.h

Core/Tools/inc/StochasticGaussian.h

Core/Tools/src/FitSuiteFunctions.cpp

Core/Tools/src/ParameterPool.cpp

Examples/IsGISAXS_examples/ex-15/isgi_SSCA.ima

Examples/IsGISAXS_examples/ex-15/this_SSCA.ima

Tests/UnitTests/TestCore/TestCore

XCode_GISASFW.xcodeproj/project.pbxproj