Increase reliability.

- These changes increase reliability at the expense of speed.
Request for computer ID and send to Input and Output.
Handle target on input.
Finish adding logic to send/receive messages by target.
Make debug messages more useful.

- Remove bad frame messages.
- List ACK send & receipt messages.
Prefix received messages with "Received: ".
Adjust ACK frame duration to be include target bits.
Add source to frame.
Make space following colon when sending message optional.