ChangeLog: https://github.com/OpenVSP/OpenVSP/releases/tag/OpenVSP_3.31.1
Features:
* Add ResetMeshDisplay button to StructScreen
* Structural assemblies can now be inserted with rest of vsp3 file.
* Measure probes and rulers can now be inserted with rest of vsp3 file.
* Drop Ubuntu 18.04 from automated build system.
VSPAERO Updates and Fixes:
* Adding sensitivities for reference quantities.
* Improve setting CpSteadyMin/Max in steady flow.
* Bump and synchronize versions to 6.4.5.
Bug Fixes:
* Improve Calculix handling of beam elements.
* Fix crash when writing *.vspgeom file from imported mesh.
* Fix Vinf activation with stability choice. Thanks Daniel R.
* Fix tags for CompGeom half*mesh. Fixes *.vspgeom half*mesh panel mode.
* Fix consistency of StructScreen current structure choice.
* Fix StructAssemblyScreen height for various recent changes.
* Fix writing of ghost nodes for half*geom *.vspgeom files.
* Fix ID handling for copy/paste and insert of structures. Thanks Bryan.
* Fix subsurface tagging bug with quad meshes.
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