[airstrike] Recent Airstrike changes

[Eero Tamminen]

Hi,

> The fixes look fine. I forgot that we were assuming calloc'd
> memory for some of the stuff. Please apply.

While looking at the patch I started to wonder what should happen in object
kill if there's no kill method specified?  Call parent object kill method or
free() directly?  Same would be done in obj_deref() I guess...
(it already checked whether kill method had been defined)?

	- Eero