Switch to side-by-side view

--- a/src/qtgui/preview_w.cpp
+++ b/src/qtgui/preview_w.cpp
@@ -61,10 +61,6 @@
 #include "guiutils.h"
 #include "docseqhist.h"
 #include "rclhelp.h"
-
-#ifndef MIN
-#define MIN(A,B) ((A)<(B)?(A):(B))
-#endif
 
 // Subclass plainToRich to add <termtag>s and anchors to the preview text
 class PlainToRichQtPreview : public PlainToRich {