new wallet wizard: wallet created in temporary directory and moved to

the destination at the final step

oshelper.cpp

@@ -0,0 +1,24 @@
+#include "oshelper.h"
+#include <QTemporaryFile>
+#include <QDir>
+
+OSHelper::OSHelper(QObject *parent) : QObject(parent)
+{
+
+}
+
+QString OSHelper::temporaryFilename() const
+{
+    QString tempFileName;
+    {
+        QTemporaryFile f;
+        f.open();
+        tempFileName = f.fileName();
+    }
+    return tempFileName;
+}
+
+QString OSHelper::temporaryPath() const
+{
+    return QDir::tempPath();
+}