new spam.el

[Ted Zlatanov <tzz@lifelogs.com>]

I have put a new version of spam.el in the CVS repository, and updated
the ChangeLog.  All the credit should go to François Pinard, who did
the hard work of putting together all the code.  The documentation is
not ready, but I think the comments in the code will be sufficient to
get people started (and those were written by François as well).  Do
let me know if you have any questions, and I'll do my best to answer.

There's a few FIXMEs in the code that I'll try to resolve soon (but
feel free to provide patches if you like).  The key bindings are not
perfect, the blackhole check is still broken (as I reported to the
ding list some time ago), but bogofilter and black/whitelists should
work right away.

The spam-split function is the main point of interest for this
release: when added to your nnimap/nnmail fancy split, it will return
either nil or the value of the spam-split-group variable, which is
"spam" by default.  The spam detection is done with several variables
you can customize.

The default spam-split-group value may be a problem if your primary
backend is nntp, for instance (since the "spam" group won't be
writeable), so make sure to customize that.  See the comments for more
details.

Again, feel free to ask any questions or make any suggestions.

Ted