[PyQt] Fix: layoutStretch property is not compiled by pyuic4

[luper rouch]

The layoutStretch property of QHBoxLayout and QVBoxLayout in designer
should be compiled to layout.setStretch() calls.

The code to do this is already present in PyQt4.uic.uiparser, but
never triggered because of an error in the types hierarchies defined
in PyQt4.uic.Compiler.qtproxies (QHBoxLayout and QVBoxLayout should be
descendants of QBoxLayout instead of QLayout).

Attached is a patch (made against
PyQt-x11-gpl-4.7.1-snapshot-20100120.tar.gz) and a .ui file showing
the issue.

-- 
Lup
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