Stable cvs version for 2.4

[Allen Curtis]

> At a gratuitous extra 4 bytes per object, that's... ok, well it's only
> wasting 32KiB which is less than I expected, but it still annoys me.
>
> > (Architectures that don't always use word-aligned pointers include
> > m68k and ARM Thumb.)
>
> Even when we're allocating from the slab and the object in question is a
> structure of size which is an even number?

How about we add 1 byte which contains up to 8 bit fields? Using bits in
pointer values sounds a lot like old Mac programming. Caution Will
Robinson....