+ add restart method to timer

src/Base/Tools.cpp

@@ -175,6 +175,11 @@ void StopWatch::start()
     d->t.start();
 }
 
+int StopWatch::restart()
+{
+    return d->t.restart();
+}
+
 int StopWatch::elapsed()
 {
     return d->t.elapsed();

src/Base/Tools.h

@@ -137,6 +137,7 @@ public:
     ~StopWatch();
 
     void start();
+    int restart();
     int elapsed();
     std::string toString(int ms) const;