pytave: py.foo support

[Colin Macdonald]

Mike,

This is awesome!  I tried this a long time ago but I found I couldn't do 
"subsref" on the static class (I had to instantiate a `py = pyfactory()` 
sort of hack before `py.foo` would call `subsref`).

I read your code but I don't see the secret?  Maybe I tried with a 
classdef style class...  or just general incompentence on my part!

Anyway, its very nice!

Colin