Use wrapper function toku_txn_is_read_only whenever it doesn't make sense to access variable directly

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The is_read_only function already took into account children, so we don't need complicated logic.

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This cleans up some of the transaction manager code.
Optimize looks at the OMT now

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closes #5180 fix ft_verify so it doesn't call the comparison function on broadcast messages, which don't have keys

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refs #5179 improve comment for get_next_ule that fixed hot indexing but, and document the client contract regarding hot db writes and index create/abort/close


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closes #5171, don't reference cachefile or fd in flush_callback when calling cachetable_free_pair, fix cachetable-test2 and toku_rollback_flush_callback to take this into account

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Also make some invariants cleaner

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the big idea is that we need to allocate space for a leaf entry and keep it around if we want to create a ULE for it. so now the provisional info holds a pointer to both the le and the ule so the caller can free it later.


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also fix the ule interface to not use const, since it doesn't do what I want because of a pesky typedef


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refs #4797


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refs #4871

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also, sort those lists
refs #4871


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 - update to yesterday before letting ctest update to today, for each run
   (so failures get emailed right)
 - use a third of the cores as -j
 - don't build tag databases
 - swap memcheck and coverage to prioritize getting more results out earlier
refs #5159


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up a little
refs #4871


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refs #4871
refs #4797


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refs #4871


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refs #4871


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