Add a system to manage the execs parameters more cleanly

Examples/ChebyshevInterpolationFMM.cpp

Examples/ChebyshevInterpolationMPIFMM.cpp

Examples/DirectComputation.cpp

Examples/RotationFMM.cpp

Examples/RotationMPIFMM.cpp

Examples/changeFmaFormat.cpp

Examples/compareAllPoissonKernels.cpp

Examples/generateDistributions.cpp

Examples/statisticsOnOctree.cpp

Src/Utils/FParameterNames.hpp

Src/Utils/FParameters.hpp

Tests/Kernels/DirectAlgorithm.cpp

Tests/Kernels/testChebTensorialAlgorithm.cpp

Tests/Kernels/testFlopsChebAlgorithm.cpp

Tests/Kernels/testRotationAlgorithm.cpp

Tests/Kernels/testRotationPeriodicBench.cpp

Tests/Kernels/testSphericalAlgorithm.cpp

Tests/Kernels/testSphericalBench.cpp

Tests/Kernels/testSphericalBlasAlgorithm.cpp

Tests/Kernels/testSphericalBlockBlasAlgorithm.cpp