pull: Associate FSF's PythonOld with SPDX's Python-2.0 (and others)

pull: Associate FSF's PythonOld with SPDX's Python-2.0 (and others)

The FSF label for PythonOld is "License of Python 1.6b1 through 2.0
and 2.1" [1].  They link to the 1.6b1 text [2].  This set does not
include 1.6a2 and earlier versions [3], and also does not include
2.0.1, 2.1.1, and newer versions [4].  I believe the splits are
exhaustive, based on:

* [5], which mentions 1.6.1, 2.0, 2.1 in this range.
* [6], which mentions no releases in this range.
* [7], which mentions 1.6.1 in this range.

[1]: https://www.gnu.org/licenses/license-list.html#PythonOld
[2]: https://directory.fsf.org/wiki/License:Python1.6b1
[3]: https://www.gnu.org/licenses/license-list.html#Python1.6a2
[4]: https://www.gnu.org/licenses/license-list.html#Python
[5]: https://docs.python.org/3/license.html#history-of-the-software
[6]: https://www.python.org/downloads/
[7]: https://www.python.org/download/releases/