v0.4.0

• Needs tsquare 0.13.2 or later (it was 0.12.1). Boards get tsquare's renderer fixes from 0.12.3 to 0.13.2.
• A board's image size and its viewer's screen chips are exact on boards with notes: they come from tsquare's measureBoardLayout, which measures notes as drawn. boardLayout's estimate could be a line or more off for a note that wraps differently than its length suggests, so the image was scaled into a slightly wrong box and the chips zoomed to the wrong place.