[t:4948] move env_simple.* out of src/tests (into /tokudb.data), update upgrade_simple.c to find them

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[t:4948] Delete some obsolete test data.  Compress some fts used in tests to reduce size of checkout.

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[t:4876], add a simple test for aborting a hot index while another transaction still has a reference to the hot index

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close[t:4715] merging 4715 to main. at a high level, ft files are removed by marking OPEN ft/cf's as unlink on close, so when the last reference goes away, the file is unlinked. we log this bit during a checkpoint's fassociate to help with aborting a hot index in the future (so it isn't stricly necessary right now).


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We can resurrect this if necessary in the future and we want to support windows.
Right now it just gets in the way and makes checkouts larger."


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[t:4871] cast pthread_t through void * to avoid -Wbad-function-cast on osx, fix toku_time.h on osx too (include errno.h)

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[t:4875] Removed cruft from ft (dictionary_opened).  Moved options in ft_handle to an options struct

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