Also merged two duplicate sections of Tools/Demos.

It had not been updated since May 2008 (6 months before Python 3 was
released!).

This now removes any special editor support by python-dev, alleviating
those burdens.

They had become extremely stale (the script to generate the file was
Python 2 compatible!). Plus the community took the work and made
improvements that are available on www.vim.org.

If you want to update Vim's runtime files to the latest available,
follow the instructions at http://www.vim.org/runtime.php .

Issue #16469: Fraction(float('nan')) and Fraction(float('inf')) now raise ValueError and OverflowError (resp.), not TypeError.

Patch by Manuel Pégourié-Gonnard

Patch by Manuel Pégourié-Gonnard

proper tests.

Patch by Brian Thorne.

UTF-8/surrogateescape, instead of the locale encoding (which may be ASCII if no
locale environment variable is set), to avoid inconsistencies with
os.fsencode() and os.fsdecode() functions which are already using
UTF-8/surrogateescape.