Multiple Transactions on same Database* cause assertion failure in thread-safe mode

[snej]

If two threads try to create a transaction on the same Database object, the second one will hit this assertion failure. The mutex works for two threads on different Database objects (on the same db file), but not when they're the same object.

(Note that this is only a valid operation when C4DB_THREADSAFE is defined at build time, since otherwise threads can't access the same objects at all.)

[snej]

Never mind -- this isn't actually correct.