Typo

In my old mt blog I used a pretty standard article filter that just did the cr/lf switching. This was similar to that provided by markdown.

In doing the conversion, I found that forcing my pages to use markdown gave me the desired format. I hacked the change into mt3.rb.

A better fix would to make the default one of the options, and have the help talk choosing a default layout

something like

  --layout LAYOUT   layout to use.  
                        A good layout that matches the standard 
                        display behaviour is markdown.