changed doxygen configuration

Doxyfile

@@ -1339,7 +1339,7 @@ HIDE_UNDOC_RELATIONS   = YES
 # toolkit from AT&T and Lucent Bell Labs. The other options in this section 
 # have no effect if this option is set to NO (the default)
 
-HAVE_DOT               = NO
+HAVE_DOT               = YES
 
 # By default doxygen will write a font called FreeSans.ttf to the output 
 # directory and reference it in all dot files that doxygen generates. This 
@@ -1414,7 +1414,7 @@ INCLUDED_BY_GRAPH      = YES
 # the time of a run. So in most cases it will be better to enable call graphs 
 # for selected functions only using the \callgraph command.
 
-CALL_GRAPH             = NO
+CALL_GRAPH             = YES
 
 # If the CALLER_GRAPH and HAVE_DOT tags are set to YES then 
 # doxygen will generate a caller dependency graph for every global function 
@@ -1422,7 +1422,7 @@ CALL_GRAPH             = NO
 # the time of a run. So in most cases it will be better to enable caller 
 # graphs for selected functions only using the \callergraph command.
 
-CALLER_GRAPH           = NO
+CALLER_GRAPH           = YES
 
 # If the GRAPHICAL_HIERARCHY and HAVE_DOT tags are set to YES then doxygen 
 # will graphical hierarchy of all classes instead of a textual one.