Recent key-value encoding changes to NSObject.

[Richard Frith-Macdonald]

The recent changes to key-value encoding in NSObject introduce five non 
standard new methods
to the API which are not used by anything (apart from some EOF code I 
guess) and make the
key-value coding methods less efficient.

It seems to me that the derived objects for which these changes are 
intended (which exist in a
separate framework), should actually be overriding the key-value 
encoding methods of NSObject,
rather than the NSObject methods being hacked to call methods in the 
derived objects.

I therefore intend to revert the changes since it seems to me that the 
required effect would
be more efficiently (and certainly more cleanly) be implemented 
elsewhere.