Switch to side-by-side view

--- a/src/qtgui/recollmain.ui
+++ b/src/qtgui/recollmain.ui
@@ -304,13 +304,14 @@
     <slot>clearqPB_clicked()</slot>
     <slot>listPrevPB_clicked()</slot>
     <slot>listNextPB_clicked()</slot>
+    <slot>previewClosed( Preview * w )</slot>
     <slot>advSearchPB_clicked()</slot>
-    <slot>previewClosed( Preview * w )</slot>
     <slot>startAdvSearch( Rcl::AdvSearchData sdata )</slot>
 </slots>
 <functions>
     <function access="private">init()</function>
     <function access="private" returnType="bool">eventFilter( QObject * target, QEvent * event )</function>
+    <function returnType="bool">close( bool alsoDelete )</function>
 </functions>
 <pixmapinproject/>
 <layoutdefaults spacing="6" margin="11"/>