RFC: notmuch-cache.el: simple caching of MIME parts

[David Edmondson <dme@dme.org>]

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I've been using remote-notmuch over a 3G connection quite a lot
recently. Dragging down the same MIME part more than once is annoying,
so here is a very simple filesystem based cache of MIME parts for
notmuch. It's integrated using defadvice for now, but a cleaner approach
is obviously possible.

No suggestion that this should be integrated - it's just a toy to prompt
discussion.

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(defun notmuch-cache-get (id part)
  "Return a cached copy of ID's MIME PART, or nil."
  nil)

(defun notmuch-cache-put (id part content)
  "Cache a copy of ID's MIME PART using CONTENT."
  )

(defadvice notmuch-get-bodypart-internal