importing the right Qstring for Python 3 on windows

patch_qstring_windows_pyqt.py

"""
This is a check to make sure the sip and the Qstrings play nicely in Windows, 
where the PySide is using the new Python API (Python 3)
http://www.mail-archive.com/matplotlib-users@lists.sourceforge.net/msg19702.html
http://stackoverflow.com/questions/1400858/how-to-create-qstring-in-pyqt4
This could be easily removed when we move to Python 3
"""
if os.name == 'nt':
    import sip
    sip.setapi('QString', 2)
    sip.setapi('QVariant', 2)
    from PyQt4.QtCore import (Qt, SIGNAL, SLOT, QSize, QString,
                              pyqtSignature, pyqtProperty)
    from PyQt4.QtCore import *
else: 
    from PyQt4 import QtGui, QtCore, uic
    from PyQt4.QtCore import Qt