Bind Insert key to new partition

Add an accelerator key for Insert to trigger the new partition menu item.

src/Win_GParted.cc

@@ -310,6 +310,7 @@ void Win_GParted::init_partition_menu()
 	menu_partition .items() .push_back( 
 			/*TO TRANSLATORS: "_New" is a sub menu item for the partition menu. */
 			Gtk::Menu_Helpers::ImageMenuElem( _("_New"),
+							  Gtk::AccelKey( GDK_Insert, Gdk::BUTTON1_MASK),
 							  *image,
 							  sigc::mem_fun(*this, &Win_GParted::activate_new) ) );
 	MENU_NEW = index++ ;