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Parents and children of check-in [a4663f09]

Change the SQLITE_Stat34 bit of the optimization test-control so that it prevents STAT4 data from being used but allows it to be loaded into the Index objects. This permits STAT4 to be turned on and off on a per-statement basis. (check-in: 489f3caf user: drh tags: trunk)
Experimental change to ANALYZE so that when computing values for sqlite_stat1, it uses the maximum number for the number of rows having equivalent values, rather than the average. (Leaf check-in: 085f17e1 user: drh tags: stat1-max)
New checks in PRAGMA integrity_check to validate the autovacuum settings in the header. (check-in: a4663f09 user: drh tags: trunk)
Enhanced detection of problems on the freelist and on overflow list in PRAGMA integrity_check. (check-in: 11e58f5b user: drh tags: trunk)