use colors in BMC status reporting

Failed properties are red, passing ones are green, and the overall result is
in bold.

Author: Daniel Kroening

src/cbmc/all_properties.cpp

@@ -159,10 +159,17 @@ void bmc_all_propertiest::report(const cover_goalst &cover_goals)
       result() << "\n** Results:" << eom;
 
       for(const auto &goal_pair : goal_map)
+      {
         result() << "[" << goal_pair.first << "] "
-                 << goal_pair.second.description << ": "
-                 << goal_pair.second.status_string()
-                 << eom;
+                 << goal_pair.second.description << ": ";
+
+        if(goal_pair.second.status == goalt::statust::SUCCESS)
+          result() << green();
+        else
+          result() << red();
+
+        result() << goal_pair.second.status_string() << reset() << eom;
+      }
 
       if(bmc.options.get_bool_option("trace"))
       {

src/cbmc/bmc.cpp

@@ -153,7 +153,7 @@ bmct::run_decision_procedure(prop_convt &prop_conv)
 
 void bmct::report_success()
 {
-  result() << "VERIFICATION SUCCESSFUL" << eom;
+  result() << bold() << "VERIFICATION SUCCESSFUL" << reset() << eom;
 
   switch(ui_message_handler.get_ui())
   {
@@ -180,7 +180,7 @@ void bmct::report_success()
 
 void bmct::report_failure()
 {
-  result() << "VERIFICATION FAILED" << eom;
+  result() << bold() << "VERIFICATION FAILED" << reset() << eom;
 
   switch(ui_message_handler.get_ui())
   {