Issue #18919: Added tests for the sunau module.  Unified and extended tests
for audio modules: aifc, sunau and wave.
Issue #19198: Improved cross-references in the cgi module documentation.
Refer to strftime(3) manpage for platform specific format codes.

Suggested by Skip Montanaro on docs@.
Issue #19207: Improved cross-references in the os, os.path, and posix modules
documentation.
 Issue #19197: Improved cross-references in the shlex module documentation.
Issue #18758: Fixed and improved cross-references.
Wing IDE is switching to PyQt...
Merge heads
Closes #16657: fix docstring of traceback.format_tb().
Closes #16732: move "xxmodule" comment block to detect_modules().  (Already done in 3.x)