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Cleaned up maybe_fsync code.

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refs #5638 Fix bug in tests where we were passing in txnid as the boolean "do_fsync" in logcursor tests

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fixes #6113 add instrumentation to the locktree, including memory stats, escalation stats, and single txnid optimization stats


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refs #6040 get random insertions working in our examples by increasing the cache size to 1G and turning checkpointing on

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fixes #5961 pass a callback to the ydb layer when escalation occurs for a txnid, providing the locktree and range_buffer describing how to update the txn's internal data structures so they don't grow out of control for very long lived write transactions


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refs #5949 make recovery_fileops_unit clean up after itself, might solve the space problem on the mac machine


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refs #5949 suppress valgrind on the first (crashing) execution of recovery_fileops_unit.tdb, for some reason raise(SIGKILL) hangs valgrind in that test

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1. disabling unique checks when num_elements > 0 (ie: the table was pre-created)
2. filling the tables with valid iibench-like data during the create phase (intercept with a function pointer, as best as I can think of for now)
3. wrapping the pk back to the beginning of the table when bounded_element_range && num_elements > 0


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closes #5942, remove cachetable-scan.cc, an old test that was meant to test if cachetable was fast enough. Outdated now

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