Switch to side-by-side view

--- a/src/utils/refcntr.h
+++ b/src/utils/refcntr.h
@@ -42,6 +42,7 @@
     X *operator->() {return rep;}
     int getcnt() const {return pcount ? *pcount : 0;}
     const X *getptr() const {return rep;}
+    bool isNull() const {return rep == 0;}
 };