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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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close[t:4669] Disable loader-test1 at the makefile (See #4668), and make the loader test faster.  Fixes #4669. Refs #4668.

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close[t:4602] Make gcc 4.6.2 stop complaining about valgrind 3.6.1 {{{unused-but-set-variable}}} warnings ({{{svn merge -c 40646 ../tokudb.4594/}}}. Closes #4602.

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#4455 add txn create and start to the tokutxn API.  this allows a txn to be created without holding any locks refs[t:4455]

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