that have chat-paging disabled.

- Fix apparent bug when there was no incoming data.
- Include the sender's avatar if one is found and the sender did not send
  the most recent message to the recipient (don't repeat the avatar
  needlessly).
- Store the information (name, address, etc.) for received imsg's in the
  recipient's property (.ini) file. This makes quickly replying easier.

Note: the receiving messages for a node-number feature should probably just
be removed.

Clean up the v2 UDP response sending stuff.

examples.

Allows IMs without using the SMTP SEND command which, is exactly what it's
designed for.