Forgot the header update for BBMD getter and setters.

Revised gateway demo to use the new device_init(NULL) way.
Eliminated triplicate I-Am responses and deprecated the offending routed_ I-Am and I-Have senders (don't see any other usages; scheduled for deletion in 2/2012).
Fixed I-Am sender to not always zero out dest->net, because if a src->net was given in Who-Is, need to have it or else global bcast in the I-Am  response.

bacnet-stack/demo/handler/s_iam.c

@@ -133,7 +133,7 @@ int iam_unicast_encode_pdu(
     BACNET_ADDRESS my_address;
     /* The destination will be the same as the src, so copy it over. */
     memcpy(dest, src, sizeof(BACNET_ADDRESS));
-    dest->net = 0;
+    /* dest->net = 0; - no, must direct back to src->net to meet BTL tests */
 
     datalink_get_my_address(&my_address);
     /* encode the NPDU portion of the packet */