sync() after write to avoid losing file data on power off.

PiPedalCommon/src/ofstream_synced.cpp

@@ -0,0 +1,19 @@
+#include "ofstream_synced.hpp"
+#include "unistd.h"
+
+using namespace pipedal;
+
+
+void pipedal::FileSystemSync()
+{
+    ::sync();
+}
+
+ofstream_synced::~ofstream_synced()
+{
+    if (is_open())
+    {
+        close();
+        ::sync();
+    }
+}