Docs: Fix doxygen links

Doxygen is now at: http://www.doxygen.nl

Reported by: Brian Piccioni.

Documentation/development/coding-style-policy.md

@@ -235,8 +235,8 @@ good practice to actually generate the Doxygen \*.html files by
 building target doxygen-docs, and then to review the quality of your
 Doxygen comments with a web browser before submitting a patch.
 
-[doccode]: http://www.stack.nl/~dimitri/doxygen/manual/docblocks.html
-[manual]:  http://www.stack.nl/~dimitri/doxygen/manual.html
+[doccode]: http://www.doxygen.nl/manual/docblocks.html
+[manual]:  http://www.doxygen.nl/manual
 
 ### 3.2.1 Function Comments ### {#function_comments}
 These go into a header file, unless the function is a private (i.e.

Documentation/development/compiling.md

@@ -462,7 +462,7 @@ you will have to apply the Boost patches in the KiCad source [patches folder][].
 [GIT]: https://git-scm.com/
 [GitHub]: https://github.com/KiCad/kicad-source-mirror
 [ngspice]: http://ngspice.sourceforge.net/
-[Doxygen]: http://www.stack.nl/~dimitri/doxygen/
+[Doxygen]: http://www.doxygen.nl
 [mailing list]: https://launchpad.net/~kicad-developers
 [SWIG]: http://www.swig.org/
 [wxWidgets]: http://wxwidgets.org/

Documentation/development/road-map-r5.md

@@ -453,7 +453,7 @@ involved with the project.
 
 **Status:**
 - In progress.  Most of the developer documentation has been converted to
-  [Doxygen markdown](http://www.stack.nl/~dimitri/doxygen/manual/markdown.html)
+  [Doxygen markdown](http://www.doxygen.nl/manual/markdown.html)
   and the [output][kicad-docs] is rebuilt automatically when a commit is
   made to the KiCad repo.
 

INSTALL.txt

@@ -114,7 +114,7 @@ GLM                  >= 9.5.4           http://glm.g-truc.net/
 
 pkg-config                              http://pkgconfig.freedesktop.org/
 
-Doxygen              (optional)         http://www.stack.nl/~dimitri/doxygen/index.html
+Doxygen              (optional)         http://www.doxygen.nl
 
 python               >= 2.6 (optional)  http://python.org/