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Parents and children of check-in [b844ac6f]

Fix issues with the io.test script. There is still a problem with a ROLLBACK TO not working on an initially empty database files. And much more testing is needed. (check-in: 09786e2a user: drh tags: experimental)
Experimental changes that cause SQLite to use bytes 28..31 of the database header to determine the database size, rather than using the actual database size. This allows database space to be preallocated. (check-in: b844ac6f user: drh tags: experimental)
Increase the estimated cost of using a virtual table as the outer loop of a join when there exists an ORDER BY clause that is not satisfied by the virtual table. Fix for [775b39dd3c]. (check-in: 9e075e70 user: dan tags: trunk)