The senario:
	upas/fs -n
	echo open /apop/pop.sally.com/steve sally.johnston > /mail/fs/ctl
	echo open /n/fred/mail/box/steve/mbox fred > /mail/fs/ctl
	faces -i -m /mail/fs/sally.johnston -m /mail/fs/fred

B3 clicking on the icons in faces doesn't work.

The problem is the logic in nedmail WRT the singleton mail file,
which I have added another clause to, however, I'am not sure how
presotto expected this to work - I may have worked around a much
simpler bug.

This code fixes the problem anyway.

-Steve