[sup-talk] PATCH: make each thread's snippet come from the latest reply, not the earliest

[Phil Snowberger]

Attached is a patch (against the SVN trunk) that makes each thread's
snippet come from the latest reply instead of the earliest.

I thought about providing a configuration option for it, but this
really seems like the Right Thing To Do, so I'll both avoid needless
work (figuring out how to add an option to sup) and go along with
William's reluctance to turn sup's configuration into a huge soupy
mess.

The motivation behind this change was that when I receive a one-line
response to an email, that one line is the most important information
about that thread at the moment, so the precious screen space in the
thread index should go to that line.

--Phil

p.s. Thanks for sup, William!  It's just what I wanted, but I hadn't
realized what I wanted until I saw it :)
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