Overwrite mode now has a warning message before you can really enable

it. Also, it alters the main frame list to show just the one frame per
ID so it is extremely obvious that you're in overwrite mode.

mainwindow.cpp

@@ -399,7 +399,17 @@ void MainWindow::interpretToggled(bool state)
 
 void MainWindow::overwriteToggled(bool state)
 {
-    model->setOverwriteMode(state);
+    if (state)
+    {
+        QMessageBox::StandardButton confirmDialog;
+        confirmDialog = QMessageBox::question(this, "Danger Will Robinson", "Enabling Overwrite mode will\ndelete your captured frames\nand replace them with one\nframe per ID.\n\nAre you ready to do that?",
+                                      QMessageBox::Yes|QMessageBox::No);
+        if (confirmDialog == QMessageBox::Yes)
+        {
+            model->setOverwriteMode(state);
+        }
+        else ui->cbOverwrite->setCheckState(Qt::Unchecked);
+    }
 }
 
 void MainWindow::updateFilterList()