it's useful for the (future) tests being able to compare lines.

we need to terminate the line on the given stream, not on *standard-output*!

I had this in my local tree for a while and forgot to commit them! Since they're here, it'd be a waste to just delete it, even if the ui stuff may not stay around in the long run.

Add blockquote support.

was added only to ease the job of the UI, but it isn’t the right place. The UI should do that type of checks, the parsers shouldn’t mangle URIs.