+Author: NeilBrown <neilb@cse.unsw.edu.au>
+Date: Mon Aug 7 14:01:35 EST 2006
+
+ Remove warning if neither 'sync' or 'async' present.
+ Add warning of neither 'subtree_check' or 'no_subtree_check' present.
+
commit 7194d7d6320736c14f40d31c3738d40f3119ead5
Author: Kevin Coffman <kwc@citi.umich.edu>
Date: Sat Jul 8 10:01:40 2006 +1000