commit, abort, and prepare

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Trying to disable syncs during child txns does nothing, also for parents when doing a dbremove
Removed pointers
Cleanup with regards to indentation/style

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stressed envs


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#refs 5133 merge undo-do algorithm changes to main. now, we read a row from the source db AND gather up the leaf entrie's provisional data in the cursor callback, which makes it atomic with respect to commit and abort on that DB. had to fix a few tests after changing some leaf entry signatures


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close[t:5134] le_cursor api cleaned up, followed up on a TODO to get rid of the DB parameter from is_key_right (and improved its name too) by using a fake_db in the le_cursor plus the new toku_ft_get_descriptor() api to grab a descriptor reference. refactored some tests to get it all compiling. LE and hot indexer tests pass


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[t:5064] Closes #5064 Move most of the work of creating xids (including malloc) out of the txn_manager_lock

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[t:5132] cast pthread_t through uintptr_t in order to print it in a way that's portable between linux and osx.  closes #5132

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also adds csv and tsv output formats (and some work on gnuplot)

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close[t:5128] updating a descriptor now has two parts: user API that passes a FT and descriptor, and a low layer API that takes those two plus an explicit descriptor. we use the low layer one for deserialization code that wants to upgrade a descriptor for an FT that is not fully opened yet (and thus whose FT does not have a valid cachefile yet). this seems to be a clean enough solution, since it helps some upgrade code do non-standard stuff.

most importantly, loader-stress-test3 no longer fails by segfaulting on ft->cf->fd


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[t:4838] the locktree now opens its own ft handle when created to ensure that the ft stays in memory so long as the lock tree is in memory. we use an on_create and on_destroy callback to keep the txn/ft logic out of the locktree. the api for toku_ltm_get_lt is a little hairy now. a better solution may come in the future. for now, the original failing test passes.


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close[t:5124] use a cleaner way of access an FT_HANDLE's descriptor pointers at the ydb layer. comment the ft API, too.


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[t:5113] carefully document a non-obvious contract requirement for change descriptor. clients may ONLY update a FT's cmp descriptor if it's the first operation done after open, before any reads or writes. further, remove the test - it's user error.


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[t:5113] spruce up the default parameters and put a reader-writer lock around the global variable used in the assertion, so we know for certain we're not just racing to read THAT variable


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