Root-relative namespace keys

[Allison Randal]

Allison Randal wrote:
> 
> But, the first line of the 'isa_pmc' vtable function is:
> 
>          if (PMC_IS_NULL(lookup))
>              return 0;
> 
> If it's throwing a null PMC access exception, that's a bug.

Oooh, I see what the bug is. The behavior is right in Class and Object, 
but was never updated in default PMC. Fixed in r35087.

Allison