[Gmsh-announce] New Gmsh release: 4.5.0

[Christophe Geuzaine]

New in 4.5.0: changed default 2D meshing algorithm to Frontal-Delaunay;
new compound Spline/BSpline commands; new MeshSizeFromBoundary command;
new CGNS importer/exporter; new X3D exporter for geometries and meshes;
improved surface mesh reclassification; new separate option to govern curvature
adapted meshes (Mesh.MinimumElementsPerTwoPi and "-clcurv val"); improved
handling of anisotropic surface meshes in 3D Delaunay; improved high-order
periodic meshing; improved 2D boolean unions; file chooser type is now
changeable at runtime; FLTK GUI can now be created and destroyed at will through
the api; fixed regression in MeshAdapt for non-periodic surfaces with
singularities; combining views now copies options; added API support for mesh
compounds, per-surface mesh algorithm and mesh size from boundary; renamed
plugin AnalyseCurvedMesh to AnalyseMeshQuality; fixed regression for built-in
kernel BSplines on non-flat geometries (Sphere, PolarSphere); small fixes and
improvements.

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