XLSForm spec proposal: add syntax to make it easy to use a value from the last saved instance

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I'm generally OK with this, but had some questions.

  1. Why isn't this a new column and not a parameter? My guess is because parameters apply to a type of question and this applies to all questions, It'd be good to be explicit in the issue that's filed.

  2. Currently in pyxform, yes is an alias for true(). That is most (all?) columns are passthrough expressions and that would not be true (pun :laughing: ) in this case. Feels dangerous to me, but I don't really have a good alternative. It's not like we can use sounds_good or no_prob as the value...