show-mode message/thread archiving improvements

[Jameson Graef Rollins]

v2 of this series to follow, based on some good feedback from David and
Aaron.

Reminder:

> The last patch changes the default keybind for the 'a' key to archive
> just the current message, and not the entire thread.  In my opinion this
> is a *much* more sensible binding for this key.  I actually rebound to
> this immediately after I started using notmuch long ago.  It also adds a
> new 'A' that performs the old function to archive the entire thread and
> move on.

jamie.
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