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[t:4297], make child transactions that are prepared be a NO-OP at the ydb layer. MySQL calls prepare on child transactions

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[t:4657], update disk stats before rebalancing, because rebalancing wipes out deltas of basement nodes

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close[t:4708] Set the rollback node size to 4KB.  Now it runs in less than one second without valgrind. Closes #4708.

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[t:4635] removing an artifact that john put in to disbale compression for tokufs. with the new, run-time configurable compression system, a compile time hack is no longer necessary.


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close[t:4574] merging 4574 to main. fixes the hcad deadlock found by Tim's stress test, which adds and drops indexes concurrent with queries and insertions. transactions no longer keep trollback nodes pinned after an operation, but instead always unpin them.

this merge also introduces a lot of improvements to our rollback code, in terms of clarity and consistency. to that end, variable names and function names were improved, as well as more documentation of the rollback logic in rollback.h and log-internal.h

roll.h is removed because it is a dead file.


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[t:4635] adding liblzma_icc_dbg.a so icc+debug builds can run test_compression_methods, turns out we needed a fourth library after all

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close[t:4671] Annotate every malloc with {{{ANNOTATE_NEW_MEMORY()}}} and get rid of the {{{--check-stack-var-yes}}}.  This fixes for valgrind 3.7.0 but not for valgrind 3.6.1.  Closes #4671.

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