Issue #10446: Several changes to module documentation generated by pydoc:

Issue #10446: Several changes to module documentation generated by pydoc:

1. Online reference manual link is now version-specific and the
   'MODULE DOCS' section renamed to 'MODULE REFERENCE'.

2. 'FILE' section is moved to the end of the file.

3. Special names processed by pydoc such as __version__ or __credits__
   are now excluded from the DATA section.

4. Defined __all__ to prevent pydoc from exposing undocumented details
   about itself.

5. Removed Python 2.3 compatibility code.