Fixed tagging of BLU lists

[John Abreau]

I've replaced the tagging of the BLU lists; instead of prefixing the
subject line, I've added two extra headers:

    X-List-Info: $LIST at blu.org; Majordomo $VERSION
    X-Sender: $SENDER

I added this on the announce, discuss, and volunteers lists and digests.

--
John Abreau / Executive Director, Boston Linux & Unix 
Email: jabr at blu.org / URL: http://www.blu.org
ICQ#28611923 / AIM abreauj
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