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Parents and children of check-in [d7a25cc7]

Add the ability to disable the omit-join-table optimization for testing purposes. (Closed-Leaf check-in: d929df9b user: drh tags: omit-join-table-opt)
Only eliminate inner loops of a JOIN if they are the RHS of a LEFT JOIN and if they give no more than a single result. This appears to give correct answers in all cases. (check-in: d7a25cc7 user: drh tags: omit-join-table-opt)
Attempt to disable inner loops of a join that do not generate output. This does not work, since the inner loops might run zero times and thus inhibit all output. Needs to be enhanced to work only for LEFT JOINs or when we know that the inner loop will always run at least once. (check-in: ca839723 user: drh tags: omit-join-table-opt)