fixes #134 Add the get/set/change_fanout API
#141 add big_txn to the locktree API
#141 rip out the escalator thread code
#141 use the escalator
#141 escalate locktrees for big transactions
#141 escalate all trees with a big txn thread when the big theshold is exceeded
Merge branch 'locktree141' of github.com:Tokutek/ft-index into locktree141