Unbreak default
This makes the tests pass against the default branch, and adjusts the Makefile to make it easier to just run a single test, and to run tests with the correct Python version.
This instance was upgraded to Heptapod 17.7.0rc1 on 2025-01-23
All legacy (hg-git based) Projects will be automatically migrated to native starting with the upgrade of 2025-01-23
This makes the tests pass against the default branch, and adjusts the Makefile to make it easier to just run a single test, and to run tests with the correct Python version.