Switch to side-by-side view

--- a/utils/confgui.cpp
+++ b/utils/confgui.cpp
@@ -134,6 +134,13 @@
         abort();
     }
     return tabWidget->addTab(qw, title);
+}
+
+void ConfTabsW::setCurrentIndex(int idx)
+{
+    if (tabWidget) {
+        tabWidget->setCurrentIndex(idx);
+    }
 }
 
 ConfParamW *ConfTabsW::addParam(