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Merge in the blocking-checkpoint enhancement, including the new

sqlite3_wal_checkpoint_v2() interface and the
PRAGMA wal_checkpoint(full) statement.

FossilOrigin-Name: bac7342c368a7c4f5f2878e08d9581dcbf57dd58
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drh committed
87fa53ee8d802b6cb37d904428f158b234f9bcf4