I haven't written user docs yet. I'm considering whether I can improve this small task by doing the larger task of splitting the man page and having notmuch help call man. The code is cleaned up quite a bit, the bug fix for 8bit characters is rolled into the series, and following a suggestion of Jani, restore now auto-detects what format the input is in. I left the default dump format as "sup" (old style) in this round. I'm leary of breaking people's scripts, so my current proposal is deprecate the sup format (as default) for a release or two.