Problem:
* Overly long embedded tweets cause Acrobat to go over the server's
line length limit which causes the message to be silently discarded
because of a lack of error handling in automsg.
Solutions:
* Make each tweet in an embedded tweet chain a seperate message
- this requires getTweet to now return a list
* Did not fix automsg at all
Signed-off-by: Matthew Vernon <matthewv@chiark.greenend.org.uk>