Fix #5361 by locking a little earlier.  This passes with helgrind but helgrind isn't yet part of the tests.

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fixes #4752 support blackhole option in tokudb, add it to the stress test framework as well as an option for prelocked write. we also fix the flags api in the ft layer to return void since they can't fail.


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 - better delete marked algorithm
 - use marked omt for fresh message tree
 - little cleanup things


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fixes #5278 fixes #5329 use an autoincrement open id for txnless environments and optionally create a txn for change_descriptor by using an autotxn


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refs #5155 refs #5308 closes #5309 merge new omt api functions to main (still unused), use templated omt for TOKUTXN->open_fts, OMT becomes a wrapper for omt<OMTVALUE>, other misc fixes

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refs #5203 Fix error handling code in loader to make it easier to track down errors if test_stress5 fails again (and general debugging)

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from valgrind tests)


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It's unnecessary since we never reuse filenames anyway.

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Loader can already handle N dbs

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If they're children, they're nosync anyway
If they're not children, they're usually unsafe

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BOOL->bool
FALSE->false
TRUE->true
u_int*_t->uint*_t

Also poisoned all of the variables

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nightly tests to use gcc optimized build too


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