boundary layes are now more robust

Common/CommandLine.cpp

Mesh/Field.cpp

Mesh/Field.h

Mesh/meshGFace.cpp

Mesh/meshGFaceBoundaryLayers.cpp

Mesh/meshGFaceBoundaryLayers.h

Mesh/meshGFaceOptimize.cpp

Mesh/qualityMeasures.cpp

Parser/Gmsh.tab.cpp

Parser/Gmsh.tab.hpp

Parser/Gmsh.y

benchmarks/2d/naca12_2d.geo

benchmarks/2d/wing-splines.geo

benchmarks/3d/Cube-01.geo

benchmarks/step/linkrods.geo