tab reorg phase 1: split main gui into "overview" and "history"

src/qt/overviewpage.h

@@ -0,0 +1,26 @@
+#ifndef OVERVIEWPAGE_H
+#define OVERVIEWPAGE_H
+
+#include <QWidget>
+
+namespace Ui {
+    class OverviewPage;
+}
+
+class OverviewPage : public QWidget
+{
+    Q_OBJECT
+
+public:
+    explicit OverviewPage(QWidget *parent = 0);
+    ~OverviewPage();
+
+public slots:
+    void setBalance(qint64 balance);
+
+private:
+    Ui::OverviewPage *ui;
+
+};
+
+#endif // OVERVIEWPAGE_H