commit 92193665 warns about duplicate node installs.  This should only be
enabled for dev builds beacuse it causes unwanted noise on production
builds.  I've enclosed the relevant commands in #ifdef DEV_BUILD, which may
or may not be appropriate.  If there's a more appropriate compile-time
option available, that could be used instead.

---
 lib/command.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/lib/command.c b/lib/command.c
index ab46fc4..bff86e5 100644
--- a/lib/command.c
+++ b/lib/command.c
@@ -638,9 +638,11 @@ install_element (enum node_type ntype, struct cmd_element *cmd)
   
   if (hash_lookup (cnode->cmd_hash, cmd) != NULL)
     {
+#ifdef DEV_BUILD
       fprintf (stderr, 
                "Multiple command installs to node %d of command:\n%s\n",
                ntype, cmd->string);
+#endif
       return;
     }