bugs fixed (what bugs? ;-)

documentation:
    man page (oh god; it'll be as bad as rn)
    internal, via describe_function [look at verify_folder_id]
       basically, all functions will be internally described.
    hackers guide

better system conf stuff to support three environments:
    BSD, SysV, POSIX  (done)

better pager (done)

rn % escapes.

better (less sloppy) input function with per-command syntax tables,
    so that tab completes on functions for describe_function,
    but on files on save, but on variables on set, etc.  ^w support.
    Completion of file names.

integrate MH messages as vi-style buffers.  These will show
up in one of the columns.  You can say "Xy to add to the X-sequence
or "xf to forward all the messages (actually, execute the 'f'
command, whatever that is) in that buffer, etc.  The unseen
sequences will show up as U's, etc.

use another column on marks, so ma or 'a work.

important: caching of folder names and messages.  This is 75%
done now, and will save a LOT of time and spares you a lot
of inconvenience.

multi-character maps/bindings.

window-size configurability, like limit scan window to max
10 lines or something.

I also want to show several applications of plum scripts for doing
things like reading from N successful folders, or for reading news
with plum.  I don't think I'll get around to a folder-display window
(in place of the scan window), although that would be nice too but
would probably be hard.  

Make sure all MH commands are supported, with syntax tables.

Make default key bindings saner.