[Nmh-workers] formatting headers - a weird case

The existing code applies a user-settable format string to parsed headers to 
generate
the scan listing.  Part of how this works is to generate a list of headers 
referenced
by the format string so that only those headers are extracted.  However, this 
doesn't
quite work in all cases.  For example, this recent message from Earl:

> Date:    Sat, 13 Nov 2010 12:30:37 CST
> To:      Jon Steinhart <jon(_at_)fourwinds(_dot_)com>
> cc:      nmh-workers(_at_)nongnu(_dot_)org
> From:    Earl Hood <earl(_at_)earlhood(_dot_)com>
> Subject: Re: [Nmh-workers] character sets and localization
>
> Return-Path: earlhood(_at_)gmail(_dot_)com
> Delivery-Date: Sat Nov 13 10:32:33 2010
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> In-Reply-To: 
> <201011131750(_dot_)oADHo7Zi021313(_at_)darkstar(_dot_)fourwinds(_dot_)com>
> References: 
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>        <84450(_dot_)1289670302(_at_)localhost>
>        
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Note that there are two Return-Path header fields.  If you do a scan -format 
"%{Return-Path}"
you'll get the value of the last one.  Is that what we want?  What is the 
proper formatting
of header fields that occur more than once.  BTW, I haven't checked, but I'd 
guess that this
is a memory leak!

Jon

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