Avoid using disp(sprintf()) construct.

src/utilities/x13/setoption.m

@@ -18,5 +18,5 @@ function command = setoption(command, optname, optvalue)
 if isfield(command, optname)
     command.(optname) = optvalue;
 else
-    disp(sprintf('Option %s is unknown!', optname))
+    dprintf('Option %s is unknown!', optname)
 end