Delete REVIEW comment about moving VerticalSlider to 'sun'.  It's on the TODO list, but there a couple of significant barriers: (1) It has a very specific look that has never been requested in any other sim, and (2) the behavior and formatting of its values is very specific to this sim, in that they can be switched between qualitative and quantitative.  So I'm inclined to defer migration to 'sun' until someone needs a slider like this.