Added support for 'killonsight' return value from URLs in body search
Found problems with processing MIME type 'multipart/alternative'.  Looking at the object containing this type will cause all the other message section objects to disappear.  Added the 'killonsight' attribute to the returned values to mitigate this, and to allow sending back a message for an immediate rejection of the message.  Still need to resolve the 'multipart/alternative' processing issue.