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right thing to do anyway, and should work just find for earlier
versions of the wrapper.  Specifically,

_doabort(), _docommit(), _mark(), _sweep(), _collect_objs():
Transactionally protect .truncate() and .consume()

_docommit(): Move the setting of the _pending flag to here from
_finish() so we can transactionally protect it more conveniently.
This does't change the semantics and the recovery code in _setupDBs()
doesn't care since the flag will already be set to COMMIT.

_begin(): Transactionally protect the setting of the _pending flag to
ABORT.