don't call Msg::Fatal unless it's really fatal

Mesh/BDS.cpp

Mesh/BDS.h

Mesh/delaunay3d.cpp

Mesh/meshGFace.cpp

Mesh/meshGRegionLocalMeshMod.cpp

Mesh/qualityMeasuresJacobian.cpp

Numeric/bezierBasis.cpp

Numeric/fullMatrix.cpp

Numeric/pointsGenerators.cpp

Plugin/AnalyseCurvedMesh.cpp

Plugin/Distance.cpp

Solver/eigenSolver.cpp

Solver/linearSystemPETSc.hpp