[Isolate-interest] Preferences

[Pete Soper]

I checked the mail and actually Josh just said "OK" and "thanks for the heads 
up" so I overstated the situation with my last msg.

The chance of Preferences getting into CDC soon appears to be slim and the
chance of it getting into CLDC appears to be none. The change I mentioned
was to revert to a variation on a proposal made by much earlier for a class 
specifically designed to carry context from a parent to a child isolate 
that is the same everywhere, with no discontinuity between implementations 
where Preferences is available vs where they are not. This in turn was 
connected to the fact that Isolate naturally goes into the bottom of the
packaging hierarchy.  A smaller issue was the fact that TransientPreferences 
didn't go into Tiger. 

-Pete