Add question to ponder in 1998/dlowe

Also USA -> US. This to make country codes more consistent with
mkiocccentry. This will be done on a wider scale (all README.md files
and the winners.csv file) soon.

1998/dlowe/README.md

@@ -4,7 +4,7 @@ David Lowe
 Pootpoot  
 67-D Manchester Street  
 San Francisco, CA 94110  
-USA  
+US  
 
 ## To build:
 
@@ -38,6 +38,8 @@ make dlowe.alt
 ./dlowe.alt < anyfile > pootfile
 ```
 
+What's the difference between this and `dlowe`?
+
 ## Judges' remarks:
 
 Why could this this entry be considered a utility?  Well because it