[Pyobjc-dev] Upgrade package

[Bill B. <bb...@co...>]

It appears that we cannot upgrade from PyObjC 0.8.0.pkg unless we call 
the 0.9 package the same thing.

Bummer.

As such, we probably need a pre-flight that detects the presence of the 
PyObjC 0.8.0 (or 0.7.0) installer package receipt and then uninstalls 
those packages prior to installing PyObjC.pkg.

Now that the package is generically named, it'll "just work" going 
forward (I just tested it).

I'm working on this problem now.

b.bum