[Python-3000] Assignment decorators

[Talin]

One other minor brainstorm before I head off to work: I'd like function 
decorators to work with assignment statements as well as 'def' statements.

Use case:

    class Foo:

       @private
       def myfunc():
          pass

       @private
       selected = True

Rationale: The 'def' statement is a type of assignment statement, in 
that it assigns a value (a function object) to a symbol. For 
consistency, the same mechanic ought to be available to other kinds of 
assignment.

-- Talin