Turn on the "source browser" feature for our generated HTML.

Doxyfile.in

@@ -649,7 +649,7 @@ FILTER_SOURCE_FILES    = NO
 # Note: To get rid of all source code in the generated output, make sure also 
 # VERBATIM_HEADERS is set to NO.
 
-SOURCE_BROWSER         = NO
+SOURCE_BROWSER         = YES
 
 # Setting the INLINE_SOURCES tag to YES will include the body 
 # of functions and classes directly in the documentation.