Switch to side-by-side view

--- a/src/qtgui/recoll.pro.in
+++ b/src/qtgui/recoll.pro.in
@@ -7,6 +7,7 @@
         advsearch_w.h \
         confgui/confgui.h \
         confgui/confguiindex.h \
+        listdialog.h \
         preview_w.h \
         rclhelp.h \
         rclmain_w.h \
@@ -41,6 +42,7 @@
 
 FORMS   = \
         advsearch.ui \
+        listdialog.ui \
         rclmain.ui \
         restable.ui \
 	spell.ui \