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Check that SiQt can be used in combination with PyInstaller

A mechanism should be implemented to extend the SiQt with virtual modules that would help to smooth the differences between different backend. For instance SiQt.QtWidgets should be importable (and redirect to SiQt.QtGui) with the PyQt4 backend, even though it was only introduced in PyQt5.

This mechanism should be optional, and enabled when the user uses the mode='compatible' option.

To test the functionality more comprehensively, one could automatically test that SiQt is able to run example directories from PyQt4, PyQt5 and PySide with a different backend. The ratio of successfully run examples then would provide a measurement of the progress for the compatibility hooks.

The current import hooks do not seem to work with Python 2. In particular,

 python2 -c "import SiQt; SiQt.use('PyQt5'); import PyQt4.QtCore"

raises the following exception,

 Traceback (most recent call last):
    File "<string>", line 1, in <module>
    File "/home/rth/src/SiQt/SiQt/siqt/importers.py", line 132, in load_module
       module = self._find_and_load_module(name, path)
    File "/home/rth/src/SiQt/SiQt/siqt/importers.py", line 181, in _find_and_load_module
     raise e
  SystemError: dynamic module not initialized properly

The test suite is failing for the same reason. The underlying issue was posted as a SO question, as I'm running out of ideas here...