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Parents and children of check-in [b78e58ae]

Make sure the in-journal boolean vector is cleared and released when ending a transaction. This fixes an obscure problem with the previous check-in. check-in: 69d749d9 user: drh tags: trunk
Do not create, open, or initialize the rollback journal until something actually needs to be written into the journal. That way, expensive filesystem operations are avoided if the transaction ends up being a no-op. check-in: b78e58ae user: drh tags: trunk
Rewrite a couple of queries used internally by FTS3 to take advantage of the "SELECT max(x) FROM ..." optimization. check-in: b7e42ae7 user: dan tags: trunk