Hi,

when copying articles from say nnml to an IMAP server, the Xref:
header isn't removed.  The new variable
`gnus-copy-article-ignored-headers' cares for this, see the attached
patch.  I have committed it.  I anyone can think of possible problems,
please let me know.

I found such a variable useful when I needed to train bogofilter from
my ham/spam collection (on nnml) by copying the collections to
corresponding IMAP folders.  Keeping Xref, X-DCC-.*-Metrics and
X-Bogosity[1] headers would have been wrong because the articles
should be as close to the original as possible.

Bye, Reiner.

[1] Actually X-Bogosity is ignored by bogofilter, IIRC.
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