[sam] Upgrade for Spamassassin 3.x ...

[Chuck Hagenbuch]

Quoting "Marc G. Fournier" <scrappy at hub.org>:

> They got rid of the rewrite_subject options, and replaced it with a
> rewrite_header one:

If your changes have any advantages over what's in  
http://bugs.horde.org/ticket/?id=3071 or cover any other ground,  
please update the ticket with your patches.

-chuck

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