string_gc_encapsulate branch is ready for merge

[James E Keenan]

Vasily Chekalkin wrote:
> Hello.
>
> string_gc_encapsulate branch is ready for merging back to trunk. Main
> purpose is to bring all STRING allocating/compacting together and
> decouple from other sides of GC.
>
> If no one will complain about it I'll merge it in about couple of days
> (+-1 day).
>

Please do not merge this until after next week's release and until it 
has been tested against the Rakudo spec test.  We've had a lot of 
breakage lately and I'd like to avert the possibility of more until 
after the release.

Thank you very much.
kid51