optimize non-summary delta backups#13
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no longer an order of magnitude slower than wal-g: parallel wal walk, prefer local files to s3, filter blocks by LSN when delta or summary missing fallback to walking wal before doing full backup
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no longer an order of magnitude slower than wal-g:
parallel wal walk, prefer local files to s3, filter blocks by LSN
when delta or summary missing fallback to walking wal before doing full backup