ffap-foo-at-bar-prefix of .emacs overridden

[Dan Jacobson]

>> I checked this out, and ffap seems to do fine for me both inside and
>> outside gnus.
>> 
>> Is there a chance that I need some special customization in order to
>> reproduce this bug?

OK, lets say it is irreproducible.
Let's just concentrate on why the user cannot do
(setq ffap-foo-at-bar-prefix "mailto") in .emacs or .gnus.el, and have
its value retained in a gnus *Article* buffer.

Examine its value in an *Article* buffer, and you'll see it has been overridden.

I saw some code in ffap.el that looked like it should use defvar
instead of setq.