Jointcal currently doesn't manage its output repo directories in the best way. We should probably use something more like os.path.dirname(__file__) + '/.test' as the directory root (currently, .test ends up in the directory it was run from, which could be jointcal/ if run from e.g. scons), and also make sure scons cleans up that directory before a run. We don't want python/pytest to do the cleanup, as we don't want to delete output/plots when a user is running tests as part of development, but having scons do it should be fine.