Getting header fields into mh-invisible-header-fields-default

I just stumbled across the documentation for
`mh-invisible-header-fields' which referenced an archived tracker item
at SourceForge. I've created a new item and updated this text:

    [ 1916032 ] Add header field to mh-invisible-header-fields-default

    https://sourceforge.net/tracker/index.php?func=detail&aid=1916032&group_id=13357&atid=113357

I see that my own copy of `mh-invisible-header-fields' has gotten pretty
thick. Let's take this opportunity to get all of our
`mh-invisible-header-fields' into `mh-invisible-header-fields-default'.
Please submit your header fields at the URL above. If you can, citing
the source of the header field (that is, the name of the program that
generated it) is very helpful. Thanks!

--

-- 
Bill Wohler <wohler <at> newt.com>  http://www.newt.com/wohler/  GnuPG ID:610BD9AD

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