Add clone vs snapshot clarification.

www/aptui/template/snapshot-help.html

@@ -26,5 +26,11 @@
 	it is done, the "Ready" flag will be checked, and your node
 	rebooted. 
       </p>
+      <p>
+	Clone vs. Snapshot? You use Clone when the experiment you are
+	running was created from another user's profile. Since you do not
+	own that profile, you cannot Snapshot. Clone it first, and then you
+	have your own profile you can instantiate and then Snapshot.
+      </p>
     </div>
   </div>