[PATCH] Sanitize "Subject:" and "Author:" fields to not contain control characters in notmuch-search

[Jameson Graef Rollins]

Hey, Florian.  I applied this patch to release-candidate/0.6, manually
adding in the formatting fixes in the same patch.

I also applied the test patch, modified to use the add_message test
suite function, which makes the patch a bit simpler.

Thanks for the fixes.

jamie.
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