#8 Support configurable word-wrapping for plain text content

[Jason Brome]

Certain text (non-HTML) newsreaders do not perform
word wrapping on articles. This can affect the
readability of certain articles, and therefore the ability to
perform word-wrapping in nntp//rss during the serving of
the article to the client would increase easy of reading.

Add word-wrapping and column-to-wrap-at configuration
items to the System Configuration. Add word-wrapping
logic to ClientHandler.