In case we triangulate, we have only one CDT2
In case we don't triangulate, we arrange intersection polygons and only
triangulate nested polygons (it's a bit more than non-simply connected
faces as the last level of nesting could be handled similarly to simply
connected faces).
## Summary of Changes
Solve issue_7164
## Release Management
* Affected package(s): Polygon_mesh_processing
* Issue(s) solved (if any): fix#7164
* Feature/Small Feature (if any):
* Link to compiled documentation (obligatory for small feature) [*wrong
link name to be changed*](httpssss://wrong_URL_to_be_changed/Manual/Pkg)
* License and copyright ownership: GF
## Summary of Changes
I start removing some IO functions which are annoying to find in the
search box. More to come.
- [x] `CGAL::write_off()`
- [x] `CGAL::write_wrl()`
- [x] `CGAL::write_vtk()`
### Todo
- [ ] remove the test cases.
## Release Management
* Affected package(s): BGL, Surface_mesh, Point_set_processing
* License and copyright ownership: unchanged
The overnight doxygen build gave warnings like:
```
.../Linear_cell_complex/doc/Linear_cell_complex/Linear_cell_complex.txt:108: warning: unable to resolve link to '::import_from_triangulation_3' for \link command
.../Linear_cell_complex/doc/Linear_cell_complex/Linear_cell_complex.txt:109: warning: unable to resolve link to '::import_from_polyhedron_3' for \link command
.../Linear_cell_complex/doc/Linear_cell_complex/Linear_cell_complex.txt:112: warning: unable to resolve link to '::import_from_plane_graph' for \link command
```
when building against the doxygen master due to the fact that doxygen was a bit more stringent
Added the namespace to the links
(also tested against doxygen 1.9.6 after the changes).
## Summary of Changes
## Release Management
* Affected package(s):
* Issue(s) solved (if any): fix#0000, fix #0000,...
* Feature/Small Feature (if any):
* Link to compiled documentation (obligatory for small feature) [*wrong
link name to be changed*](httpssss://wrong_URL_to_be_changed/Manual/Pkg)
* License and copyright ownership: