Hgpovray38 229 Betterave, at 25th October 2020

Based on Povray 3.8

Corrections & Changes

• removed tiny rotation of text
• fix for FS#324 (rendering mesh/mesh2 artifact, regression from 3.6)
• UV-mapping of Ovus is oriented the same way as lemon, cone, cylinder
• Unix-specific: display error on options (command line and ini file)
• fix the angles of icosahedron and tetrahedron from shapes2.inc

Extensions & Additions

✔ cameras, data access and new types: cameras
✔ compound objects, data access to inner objects: compound
✔ long auto-folding text: galley
✔ generalized symetric difference, interunion, intermerge: gsd
✔ mesh tools, data access and transformations: mesh
✔ nurbs: nurbs
✔ patterns, new types: patterns
✔ polygon using winding number for filling: polyline
✔ rational_bezier_patch: rational_bezier_patch
✔ render pattern: spirals render pattern
✔ skeleton of mesh: skeleton
✔ sphere_sweep, uv mapping: sphere_sweep
✔ splines, data access and new types: splines
✔ traces, methods to transform get uv data from traces: trace
✔ tesselations, methods to transform into mesh: tesselation
✔ UVMapping, cylinder, cone, sphere_sweep, disc, lemon: UVMapping
✔ UVMeshable, data access for classes of objects, transform into mesh: UVMeshable
✔ warp rotate, wrapping to or from shapes: warp 

Bugfix specific to hgpovray38

• problem with missing media in advanced/abyss.pov (background turned black instead of cyan, tied to media computation)