Error: Set weight outside palette

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Off-palette predictions should be supported. This means that when the predictor predicts a character that isn't in the palette, it still gets put in the zoombox hierarchy somewhere so that the user could include it in their message. One way to support this would be to change the palette template to have rules for which characters go in which groups, and in what order. Currently group membership and order is pretty much hard coded. See https://github.com/dasher-project/redash/blob/master/browser/dasher/palette.js#L4