yet, but the test targets should be pretty static from here on out, except
adding new tests.
* Fixed up lock and coded unlock in MoobotFactoids (actually, factored the
common code out into one helper function that each call).
* Added the changeFactoids (=~) portion.
* Changed the table structure again (should be the last time). Locked_by was
redundant if we're only going to let factoid creators lock/unlock. Removed
it.