rename namespace MathFunctions -> Math

Base/Utils/Bessel.cpp

Base/Utils/Bessel.h

Base/Utils/MathFunctions.cpp

Base/Utils/MathFunctions.h

Core/Computation/PoissonNoiseBackground.cpp

Device/Beam/FootprintGauss.cpp

Device/Histo/SimulationResult.cpp

Device/Instrument/FourierTransform.h

Device/Resolution/Convolve.h

Device/Resolution/ResolutionFunction2DGaussian.cpp

Sample/Aggregate/InterferenceFunction2DSuperLattice.cpp

Sample/Aggregate/InterferenceFunctionFinite2DLattice.cpp

Sample/Aggregate/InterferenceFunctionFinite3DLattice.cpp

Sample/Aggregate/InterferenceFunctionHardDisk.cpp

Sample/Correlations/FTDecay1D.cpp

Sample/Correlations/FTDistributions1D.cpp

Sample/Correlations/FTDistributions2D.cpp

Sample/Correlations/IPeakShape.cpp

Sample/HardParticle/FormFactorAnisoPyramid.cpp

Sample/HardParticle/FormFactorBox.cpp