Updated: python packages

[Marco Atzeri]

Several python packages have been updated

	python36-3.6.12-3
	python37-3.7.9-3
	python38-3.8.7-3

to solve the issue:
https://sourceware.org/pipermail/cygwin/2021-January/247610.html

the following package were added:

	python{36,37,38}-matplotlib-3.3.3-1


CYGWIN CHANGES

As python2 is no longer supported

https://devguide.python.org/devcycle/#end-of-life-branches

the package are updated to include postinstall script that
use "alternatives" to define for

   /usr/bin/python

   /usr/bin/python3
   /usr/bin/idle3
   /usr/bin/pydoc3

a default to the highest package available.

$ alternatives --display python
python - status is auto.
  link currently points to /usr/bin/python3.8
/usr/bin/python3.7 - priority 37
/usr/bin/python3.8 - priority 38
/usr/bin/python3.6 - priority 36
/usr/bin/python2.7 - priority 27
Current `best' version is /usr/bin/python3.8.

The following link are not provided anymore.
/usr/bin/idle
/usr/bin/pydoc

The python3 package will pull python38 package.

Rationale:
https://www.python.org/dev/peps/pep-0394/
In other systems as Debian
/usr/bin/python is discouraged.

As on Cygwin we have still several third packages depending on
python2, the usage of alternatives should allow to manage
until all are updated to python3

DESCRIPTION
Python is a programming language that lets you work quickly
and integrate systems more effectively.
Python is powerful... and fast; plays well with others;
runs everywhere; is friendly & easy to learn; is Open.

HOMEPAGE
https://www.python.org/

Regards
Marco Atzeri


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