Value List Widget

This page describes the design for a value list editor. It is currently used in ParaView in the Contour filter.

In general, I believe that we should have as much 'active content' on the screen as we can, and get rid of things that should be modal dialogue boxes, or that can be supported through direct manipulation of a widget. This proposal describes a directly-manipulated list of values, meant to replace the UI that ParaView currently uses for creating a list of values in the Contour filter UI.