* use "inherited" doc strings, i.e. for
    class A:
        def meth(self):
            "doc1"
    class B(A):
        def meth(self): 
            pass

    B.meth should display the A.meth docstring, probably 
    with special formatting (italics or so). 

  NOT YET DONE (later?)

* add warning about py.test possibly not covering the whole API