The Parallel Toy (up to date with and slightly more recent than The Powder Toy 99.5)

Build 5
	Rewrite from scratch, should be much more stable, but see below
	sim.threads(0) is now equivalent to single-threaded TPT
	sim.threads(1) is multi-threading-capable TPT but with only 1 thread enabled; useful for establishing a reference
	Subframe is broken; this is by design and will not be fixed
	Water equalization hinders multi-threading
	Partial frame steps hinder multi-threading and are no longer a useful debug tool
	Lua scripts are expected to crash the game, please do not report such issues
