Switch to side-by-side view

--- a/src/qtgui/recoll.pro.in
+++ b/src/qtgui/recoll.pro.in
@@ -48,6 +48,7 @@
         rclhelp.cpp \
         rclmain_w.cpp \
         rclzg.cpp \
+        respopup.cpp \
         reslist.cpp \
         restable.cpp \
         rtitool.cpp \