bitkeeper revision 1.1159.242.1 (4203fb9erjxo9v5Lwlohe2bcTrLYpg)

bitkeeper revision 1.1159.242.1 (4203fb9erjxo9v5Lwlohe2bcTrLYpg)

     1. Deleted slab.c, added xmalloc.c.  Do not rename header or remove
        unnecessary includes (yet).
     2. Add explicit align arg, although current implementation
        over-aligns.
     3. Add list_for_each_entry_safe().
     4. Make xmalloc_array use _xmalloc_array, to avoid duplicate eval
        of "num" arg.
     5. Rearrange slab.h a little to show the exposed functions/macros
        first.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: ian.pratt@cl.cam.ac.uk