Revert "pythonmpi4py: turn into a dummy package"
Also bring it up to date to version 3.1.3, add selftests, and ensure it lists its license files.
This reverts commit a8959015.
System updates will be applied on Nov 25th between 7am and 9am, EST (UTC-05:00). This site will have intermittent downtime during that time.
Also bring it up to date to version 3.1.3, add selftests, and ensure it lists its license files.
This reverts commit a8959015.