notmuch-emacs: WISH: command notmuch-show-message-up with key bindung u

[Gregor Zattler]

Dear notmuch developers, when reading a long going discussion
which is deeply threaded, it often would come in handy if it was
possible to jump up to the parent message of the message on is
reading, unfolding this message in notmuch-show if necessary.
This command notmuch-show-message-up or
notmuch-show-parent-message could be bound to "u" since this key
is not used in notmuch-show-mode-map.



Thanks for your attention, Gregor
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