shaking down nicely

COODBMS runs consistently until it is about 3 Mb in size. Then the caching problem nails it every time. But that was long enough a run time to complete some nice multi-threading stress tests, which it passed with flying colors.

So there is still the odd bug or 3, but we are getting close to a production release. We also need one final feature--load/dump to external files. This will be essential for migration to new releases as the internal structures evolve.