In #5226 we already fixed a problem regarding the subtle interaction between the `cgaAdvancedEnd` command and table rows / columns.
In this PR a subtle interaction between the `\cgalAdvancedEnd` and the `pre` command is solved.
xmllint gave the following type warning:
```
Periodic_2_triangulation_2/classCGAL_1_1Periodic__2__triangulation__2.html:1418: parser error : Opening and ending tag mismatch: dd line 1418 and div
"This is an advancedSurface_mesh_deformation function.">is_triangulation_in_1_sheet()</a></code> </div>
```
this type of warning appeared for the packages:
- Periodic_2_triangulation_2
- Point_set_3
- TDS_3
- Triangulation
- Triangulation_2
for the package Surface_mesh_skeletonization we again saw a warning like:
```
Surface_mesh_skeletonization/classCGAL_1_1Mean__curvature__flow__skeletonization.html:519: parser error : Opening and ending tag mismatch: td line 519 and div
raph_traits<TriangleMesh>::vertex_descriptor</code> as value type. </div>
```
this is also fixed with this PR.
```
warning: Tag 'LATEX_SOURCE_CODE' at line 1971 of file '.../doc_dxy/BaseDoxyfile' has become obsolete.
To avoid this warning please remove this line from your configuration file or upgrade it using "doxygen -u"
warning: Tag 'RTF_SOURCE_CODE' at line 2061 of file '.../doc_dxy/BaseDoxyfile' has become obsolete.
To avoid this warning please remove this line from your configuration file or upgrade it using "doxygen -u"
warning: Tag 'DOCBOOK_PROGRAMLISTING' at line 2166 of file '.../BaseDoxyfile' has become obsolete.
To avoid this warning please remove this line from your configuration file or upgrade it using "doxygen -u"
```
these tags have been declared obsolete (in the current master version), so they should be removed..
CGAL doesn't use the involved formats so this has no influence on the CGAL documentation processing.
In pull request #4644 a central MATHJAX_CODEFILE was introduced, but the snap rounding package was omitted, so this is corrected here.
For the MathJax V3 ( see #5707) this change is even mandatory (the current construct doesn't work).
Below the bottom blue block we see for the packages some extra white space. For the Manual page this white space is not present.
The reason is the placing of the "hack.js" code.
In the version 1.9.0 the setting `COLS_IN_ALPHA_INDEX` has been made obsolete and generates a warning during building.
As the default value is used it can also be removed (doxygen will automatically take the default value in the older versions).
For a better quality also the close image was converted to an svg image, so the png does not exists anymore. This has to be reflected in this file as well.