Switch to side-by-side view

--- a/src/common/rclconfig.cpp
+++ b/src/common/rclconfig.cpp
@@ -868,7 +868,13 @@
 {
     if (mimeview == 0)
         return false;
-    if (!mimeview->set(mt, def, "view")) {
+    bool status;
+    if (!def.empty()) 
+	status = mimeview->set(mt, def, "view");
+    else 
+	status = mimeview->erase(mt, "view");
+
+    if (!status) {
 	m_reason = string("RclConfig:: cant set value. Readonly?");
 	return false;
     }