Objective C features manual

[Stan Shebs]

"Joseph S. Myers" wrote:
> 
> I think this manual would make more sense moved to the gcc directory and
> included as a chapter of the main GCC manual.  What do other people think?
> If it's agreed that this would be a good idea, I'll produce a patch.

That'll teach me not to go to all-day meetings. :-)  I was thinking
about whether it made more sense as a manual chapter or as its own
doc, but I see that the decision has been made for me!  I'm OK with
the change though, for both trunk and 3.0 branch.

Stan