Consistency / links in LaTeX output of the doxygen documentation

- link under LaTeX the `\memberof` description to the example (like in HTML)
- handle the source file analogous to e.g. the example with the `\overload` directory command

- reduce space a little bit in the LaTeX introduction chapter of the manual (index.doc)

Author: albert-github

doc/commands.doc

@@ -610,7 +610,8 @@ Structural indicators
   when the programming language does not support this concept natively
   (e.g. C).
 
-  The file \c manual.c in the example directory shows how to use this command.
+  The file \c manual.c in the example directory shows how to use this command
+  (see also \ref cmdmemberof "\\memberof" for the complete file).
 
   \htmlonly
   Click <a href="examples/manual/html/struct_car.html">here</a>
@@ -790,7 +791,8 @@ Structural indicators
   when the programming language does not support this concept natively
   (e.g. C).
 
-  The file \c manual.c in the example directory shows how to use this command.
+  The file \c manual.c in the example directory shows how to use this command
+  (see also \ref cmdmemberof "\\memberof" for the complete file).
 
   \htmlonly
   Click <a href="examples/manual/html/struct_car.html">here</a>
@@ -898,12 +900,17 @@ Structural indicators
   \ref cmdpublic "\\public", \ref cmdprotected "\\protected" or
   \ref cmdprivate "\\private".
 
-  The file \c manual.c in the example directory shows how to use this command.
-
+  \par Example:
+  The file \c manual.c in the example directory shows how to use this command:
+  \include manual.c
   \htmlonly
   Click <a href="examples/manual/html/struct_car.html">here</a>
   for the corresponding HTML documentation that is generated by doxygen.
   \endhtmlonly
+  \latexonly
+  See \hyperlink{struct_car}{Car struct reference example}
+  for the corresponding \mbox{\LaTeX} documentation that is generated by doxygen.
+  \endlatexonly
 
   \sa sections \ref cmdextends "\\extends", \ref cmdimplements "\\implements",
       \ref cmdpublic "\\public", \ref cmdprotected "\\protected" and

doc/index.doc

@@ -18,14 +18,13 @@
 \mainpage
 <!--Doxygen Manual-->
 \if logo_on
-<center>
 \htmlonly
+<center>
 <img src="doxygen_logo.svg" width="634" height="197" alt="doxygen"/><br/>
 Version: $(VERSION)
-\endhtmlonly
 </center>
+\endhtmlonly
 \endif
-
 <h2>Introduction</h2>
 Doxygen is the de facto standard tool for generating documentation from
 annotated C++ sources, but it also supports other popular programming