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Parents and children of check-in [5348ffc3]

Fix two problems that could cause fts3 auxiliary functions to occasionally misbehave if used with match expressions that contain both OR and NEAR. (check-in: 372c1db2 user: dan tags: trunk)
Enhance the pcache1 page cache so that it tries to allocate a block of SQLITE_DEFAULT_PCACHE_INITSZ pages from malloc() on startup, and uses those preallocated pages when possible rather than going to malloc() for each individual page. About a 5% performance increase for some workloads. (check-in: 5348ffc3 user: drh tags: trunk)
Comment fix. No changes to code. (Closed-Leaf check-in: c1e2ed0e user: drh tags: pcache-bulk-local)
Early detection of file corruption in a debugging routine, before the invalid data can cause problems. (check-in: b27a47fe user: drh tags: trunk)