Doxyfile.in: Switch on referenced-by linking

Author: ferdnyc

Doxyfile.in

@@ -991,7 +991,7 @@ STRIP_CODE_COMMENTS    = NO
 # entity all documented functions referencing it will be listed.
 # The default value is: NO.
 
-REFERENCED_BY_RELATION = NO
+REFERENCED_BY_RELATION = YES
 
 # If the REFERENCES_RELATION tag is set to YES then for each documented function
 # all documented entities called/used by that function will be listed.