v0.5.0

A shark joins the dog.

• shark: a shark patrols the open sea through a day and night that keep real time. It cruises, follows passing rays and turtles, stalks a school from below and strikes, glides with its fin cutting the surface, and rests on the sand at night. Remoras and pilot fish ride along, and after dark the plankton glows in its wake while lanternfish rise. oxiper -s shark
• Four species, every sprite drawn by hand: a great white in a kelp forest, and a hammerhead, a tiger shark and a whale shark (which only filter-feeds) in warm coral seas. The tail beats through foreshortened frames, the body tilts as it climbs and dives, and turns pass through a three-quarter view and a head-on view. -o shark.kind=hammerhead, or random.
• Options: zoom from the whole sea (0) to a close-up (6), day for the length of a day, fish for how crowded the schools are, rays for the light shafts and caustics, and water = false to keep translucent terminals see-through.

Full Changelog: v0.4.0...v0.5.0