[PATCH] Output unmodified Content-Type header value for JSON format.

[David Edmondson]

> Technically the IRC discussion was about not including *any* part
> content in the JSON output, and always using show --format=raw or
> similar to retrieve desired parts.  Currently, notmuch includes part
> content in the JSON only for text/*, *except* when it's text/html.  I
> assume non-text parts are omitted because binary data is hard to
> represent in JSON and text/html is omitted because some people don't
> need it.  However, this leads to some peculiar asymmetry in the Emacs
> code where sometimes it pulls part content out of the JSON and
> sometimes it retrieves it using show --format=raw.  This in turn leads
> to asymmetry in content encoding handling, since notmuch handles
> content encoding for parts included in the JSON (and there's no good
> way around that since JSON is Unicode), but not for parts retrieved as
> raw.

Including the text output in the JSON results in significantly fewer
calls to 'notmuch' during the building of a typical `notmuch-show-mode'
buffer. Someone with one of those older, crankier computers could easily
test how much effect this has by changing
`notmuch-show-get-bodypart-content' slightly.

> The idea discussed on IRC was to remove all part content from the JSON
> output and to always use show to retrieve it, possibly beefing up
> show's support for content decoding (and possibly introducing a way to
> retrieve multiple raw parts at once to avoid re-parsing).  This would
> get the JSON format out of the business of guessing what consumers
> need, simplify the Emacs code, and normalize content encoding
> handling.

Is there a real problem being solved here? Having a clean structure is
nice, except when it's not.
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