[MlMt] Changed prefs

[John D. Muccigrosso]

Once again, MailMate 2 has just changed my settings on me with no 
warning and no upgrade. Right now I'm wondering how to set it so that it 
marks messages as read when they are, uh, read and not otherwise.

It looks like the View options might have changed. Previously I had it 
set for 3 panes, but hid the message preview.

Right now I have the pref set so that the "Mark messages read after __ 
seconds" is unchecked.

John