We want to get to single-DB mode ASAP. Is anything still blocking us from enabling it today?
* One or two test failures?
- I see stat_tests 5 and 6 failing at r991181.
* Upgrade from 1.6?
- I don't think this should block it.
* Upgrade from 1.7-dev?
- The Py script seems sufficient.
I see no blockers after the stat tests are fixed, so I intend to enable
it then. Any objections?
- Julian
