Remove obsolete gtk_extras/FauxActionGroups.py.
Remove obsolete gtk_extras/fauxDruid.py.
Remove obsolete gtk_extras/chooserNotebook.py.
Remove obsolete gtk_extras/ThumbnailGenerator.py.
Remove obsolete checks for PyGTK version < 2.8.
Fix setup.py so it works on non-Windows platforms again.
Remove a bunch of unused imports.