minirst: improve layout of field lists Before, we used the padding following the key to compute where to wrap the text. Long keys would thus give a big indentation. It also required careful alignment of the source text, making it cumbersome to items to the list. We now compute the maximum key length and use that for all items in the list. We also put a cap on the indentation: keys longer than 10 characters are put on their own line. This is similar to how rst2html handles large keys: it uses 14 as the cutoff point, but I felt that 10 was better for monospaced text in the console.