[Tutor] Digest format changed to MIME

[Alan Gauld]

As mentioned earlier I've changed the digest format to MIME.
If anyone has problems receiving that please let me know
offline and we'll try to resolve it.

Hopefully this will allow digest users to reply to individual
messages and avoid the frequent resending of entire digests.

It may even fix the subject line and maintain threading,
although I'm less confident on that last one.

-- 
Alan G
Author of the Learn to Program web site
http://www.alan-g.me.uk/
http://www.amazon.com/author/alan_gauld
Follow my photo-blog on Flickr at:
http://www.flickr.com/photos/alangauldphotos