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refs #5801 merge 5801 (improve threaded stress test framework) to main: now the loader is used for sufficiently large tables, correctness tests fill tables with zeroes while performance tests fill them with bytes based on compressibility, and both use similar code paths for key/val generation for better consistency and readability


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Modified loader-stress-test-4z (row count /= 10, row size *= 10) to make it faster in valgrind

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refs #5672 #5351 increase drd timeouts some more (ugh), make locktree stop reporting false positives


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Fix #5833.  Add a test that notices the lack of locking while initialing a partitioned counter, and fix it.

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closes #5784 don't run valgrind on tdb-recover because it's statically linked and we can't change --soname-synonyms for just one child


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- minimum key/val size is up to 8 bytes. now perf tests and stress tests have a consistent mechanism for generating keys and values, reducing headache.
- perf tests use a "main" function that generates tables based on the provided key/val size and compressibility, while stress (correctness) tests use a main function that generates tables with a provided (default in all cases, I think) key/val size and fully zero'd values, so the table is in the "correct" zero-sum state. previously this was causing perf tests to generate zer-valued rows always, no matter what row size you wanted or how much compressibility was requested, which clearly skewed performance results (ie: your 100 byte rows are only 8 bytes)
- renamed legacy NULL pointers to nullptr
- moved some "special" operations to the perf/stress tests that use them instead of the global header, to keep things more tidy.



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take into account things could be negative (so use int64_ts instead of uint_64) and set appropriate max for size_current

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