Remove fallback to 24x80, and fix docstring formatting.

There are some advantages to falling back to 24x80: for example, the ability to easily render output based on height and width when being piped through `less`. However, that's a backward incompatible change--we explicitly documented the None return values in earlier versions--so I don't want to make it lightly. Reverting it for now because I want to get the unquestionable parts of this merged in.

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