Checkpoint before writing BitemporalSparesLoder SparseTemporalCursor
First plausible version of BitemporalSparseLoader. Doubtless it is buggy though.
Kill some dead code
First steps to a nice randomized test... plus some FIXMEs for bugs it exposed
Fixes uncovered by random test
Bug fixes found by nondeterministic testing
Test the bitemporal aspect of the DB
Test fixes only
Delete dead code
Comments only