Update for change to csql.Inserter interface.
Close the reader as soon as we're done reading.

Waiting until after the transaction is committed may result in
an FTP timeout which seems to make it difficult to close. Bah.
Update SQLite schema.

Remove index on actor table and use a PK instead.

Make most/all columns NOT NULL. Prefer zero values.
If a subsearch returns no results but there's no error, give it an
invalid atom id so the search fails.
Tweaks to loading. i.e., don't load atoms if we don't need to.
Some benchmarks and other explanations.
specify configuration