new version of viterbi implementation

fix all:atvars reporting bad info
fix bad S info in x86_64


git-svn-id: https://yap.svn.sf.net/svnroot/yap/trunk@1968 b08c6af1-5177-4d33-ba66-4b1c6b8b522a

C/tracer.c

@@ -58,7 +58,7 @@ send_tracer_message(char *start, char *name, Int arity, char *mname, CELL *args)
       if (i > 0) fprintf(Yap_stderr, ",");
 #if DEBUG
 #if COROUTINING
-      /* Yap_Portray_delays = TRUE; */
+      Yap_Portray_delays = TRUE;
 #endif
 #endif
   omax_depth = max_depth;