Re: deferred deallocation of local objects

[Richard Frith-Macdonald]

I've finally committed the stuff I've been working on for this ... 
while DO updates are still a work in progress. I wanted to get 
something out before attempting any more radical changes.  Basically 
the current code adds counting of the times an object is vended byref 
and restructures the interraction between NSDistantObject and 
NSConnection to try to ensure thread safety and simplicity/efficiency.  
I spent a lot of time/thought trying to ensure it was as backward 
compatible as possible, but it may leak objects in the new code when 
talking to servers running the old code.

I'd appreciate testing/feedback in case I've introduced problems that 
my tests have not shown up.