Changes to support python 3.9 (RHEL9)

[dsugar100]

To try to address issue #819

[pebenito]

I think this tool will instead have to be disabled if you're building on Python 3.9; see #816. It pulls in SETools, which requires 3.10.

[dsugar100]

In #816 it seems to imply that SETools is optional. If that is the case, it would be nice to still have the rest of this stuff work, even if the SETools isn't available.

[pebenito]

Fair enough. This can move forward, but as with other RHEL9 support, it isn't a priority for me to ensure it continues to work.

[dsugar100]

I understand, and with #816 merged, I think I will need to rebase this. I will hopefully get to it this week.