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Addresses #2090 refs[t:2090] Bugfix in cachetable_reserve_filenum(), added test program to exercise filenum reservation/release.

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We don't want to partially upgrade a database and we don't have the logic to automatically
create the fileops directory.  This is done simply by setting 
  BRT_LAYOUT_MIN_SUPPORTED_VERSION = BRT_LAYOUT_VERSION
and leaving some unused code in place.


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Addresses #2165 refs[t:2165] Test that env->dbremove() and env->dbrename() return correct error code when given a zombie db.

git-svn-id: file:///svn/toku/tokudb@15879 c7de825b-a66e-492c-adef-691d508d4ae1

Addresses #2164 refs[t:2164] Take brtheader lock when accessing zombie/live lists during fdelete on commit.

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only way for that to be open is if it was deleted, and checkpoint holds it open (which is not an issue to prevent rename).

Also, when renamed, the list of zombie dbs is updated with the new dname.

git-svn-id: file:///svn/toku/tokudb@15852 c7de825b-a66e-492c-adef-691d508d4ae1

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We run 'backward' recovery and 'forward recovery' on the item we turn around on, so do not set 'forward saw checkpoint begin' state
till we're in forward recovery.

git-svn-id: file:///svn/toku/tokudb@15849 c7de825b-a66e-492c-adef-691d508d4ae1

Added missing state transaction (turn around on checkpoint begin with no transactions)
Added error checking for unlink (anything but 0/ENOENT is real error)

Changes due to code review with Barry

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 * Before 'checkpoint begin'
  * fcreate
   * Will not create (treated as fopen)
   * Will not delete file
   * Will force rollback entry of fcreate (if file exists)
 * After checkpoint begin
  * fcreate
   * Will create
   * Will first delete file
   * Will force rollback entry of fcreate (if file exists)



git-svn-id: file:///svn/toku/tokudb@15844 c7de825b-a66e-492c-adef-691d508d4ae1

Closes #2180 closes[t:2180] Recovery forces 'fcreate' in rollback log (when replaying fcreate log entry)

git-svn-id: file:///svn/toku/tokudb@15841 c7de825b-a66e-492c-adef-691d508d4ae1

Addresses #652, #2170, #2178 refs[t:652,2170,2178] Merge from 3.0.0-logging branch with command: svn merge -r15784:HEAD https://svn.tokutek.com/tokudb/mysql.branches/3.0.0-logging/tokudb .

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