PR: Add back legacy PYQT4 and PYSIDE package-level constants for compat #279
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As discussed in #85 (comment), especially if we're going to keep around old non-constant top-level variables that were only used internally (
is_old_pyqt
andis_pyqt46
), we may as well keep thePYQT4
andPYSIDE
module-level constants around (alwaysFalse
now) for backward compatibility, and easier cross-compat between QtPy versions.