[aquaria] Patch to run Lua scripts as threads

[Ryan C. Gordon]

> think I read that local variables are also faster than globals, though 
> I can't recall the reference at the moment.

They are faster; global variables go through a table lookup for each 
access, locals do not.

You'd be hard-pressed to call this a serious performance issue in 
practice, though. But if you're benchmarking for just this, you'll find 
locals are in fact cheaper in Lua.

--ryan.