UPDATE: pyQt4 based dialogs

qtqui.py is intended to end up being a pyqt4 version of the gui.py
functionality.

Has file dialogs, base Dlg class, and some alert dialog types.
Missing the DlgFromDict class, will add tomorrow.

qtgui.py can be run as a demo script and will display each implemented
dialog type.

Only tested on Windows so far!
Merge branch 'master' of git://github.com/psychopy/psychopy
Merge pull request #747 from isolver/master

UPDATE: pyQt4 based dialogs