dwgui now passes test_shake.py

I've now fixed up the calldll backend which I call dwgui so that it
passes the test_shake.py ok.

I'm willing to try and extend my success to the mswgui backend if some
way can be found to transmit the result to the repository.

Main points of the required changes were
1) fix up the generic getGeometry method so it does the 'right' thing
wrt containers relative positions.

2) correct the geometry for toplevels to respect the size of the added
frames.

3) fix  listboxes to be non-integral sized. 
-- 
Robin Becker


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