- Update doxyfile to 1.8.7

- Add some documentation to get the to and from vertices to mesh navigation Doc

closes  #2186



git-svn-id: http://www.openmesh.org/svnrepo/OpenMesh/trunk@1069 fdac6126-5c0c-442c-9429-916003d36597

Doc/navigation.docu

@@ -7,6 +7,7 @@
 \li \ref nav_bound
 \li \ref nav_io
 \li \ref nav_opposite
+\li \ref nav_to_from
 
 \section nav_intro Introduction
 
@@ -98,4 +99,16 @@ There are also a few more functions that offer easy access to opposing structure
 
 \include nav_code4.cc
 
+
+\section nav_to_from Getting the to and from vertices
+
+\image  html mesh.to.from.png
+
+If you have an halfedge, you can get the to and the from handles of the adjacent vertices.
+\note The halfedges have a direction. Therefore the to vertex is the from vertex of the opposite halfedge and vice versa.
+
+\include nav_code_to_from.cc
+
+
+
 */