Message5050

I think that the machinery needed to workaround the problem and support
using Class.forName from Python code is not worth the effort. 

I propose to explicitely discourage Class.forName('foo.bar.Baz'), since
you can get the desired effect either by doing  "import foo.bar.Baz", if
the class name is known beforehand, or __import__(className), if it's not.

We could even hack PyReflectedFunction to check if it is going to call
Class.forName(String) and print a loud warning.