Switch to side-by-side view

--- a/src/qtgui/recoll.pro
+++ b/src/qtgui/recoll.pro
@@ -9,7 +9,8 @@
 
 FORMS	= recollmain.ui \
 	advsearch.ui \
-	preview/preview.ui
+	preview/preview.ui \
+	sort.ui
 
 IMAGES	= images/filenew \
 	images/fileopen \